yashsingh1/xdaforums huggingface dataset:
[Galaxy S II Q&A, Help & Troubleshooting] -T-:
I've been suffering also from these random "reboots" where phone will be asking SIM PIN code when you take it out from the pocket. I haven't seen my phone rebooting and I'm using Power Amp without any reboots while listening. These reboots happen only when phone has been in my pocket. Only "reminder" from the reboot is the screen for entering PIN code.

Now a couple of days ago I did check which processes were running at the background. Then I either removed some apps not needed or I disabled Widgets. I noticed that I had Skype running at the background (even if I hadn't configured/used it at all). Also I had a bunch of processes for Widgets running even if these widgets were for TouchWiz (I'm using Launcher Pro).

I removed Skype and ADW notifier (cannot remember if this had any active processes) and all active widgets from TW. Since then (two days ago) I haven't had any random reboots which were seen earlier at least once a day. I know this is too early to say anything especially since I've rebooted phone a couple of times intentionally due to customization for the battery full notification.

(KF3 with CF-root)
[Galaxy S II Q&A, Help & Troubleshooting] EarlZ:
I've never had this problem on my phone, I've had it for 3 weeks now. Must be the KE7 firmware, mine shipped with KF1.
[Galaxy S II Q&A, Help & Troubleshooting] blue265:
I was having the reboot problem every few days but since flashing KG1 it has pretty much stopped. I had the phone running 8 days straight and it finally rebooted on its own. Still a big improvement of random reboots all the time. I'm on KG2 now and will see how this works out
[Galaxy S II Q&A, Help & Troubleshooting] mbevc1:
Must say with stock KG1 this does not happen....
[Galaxy S II Q&A, Help & Troubleshooting] arabbitte:
It's gone back. The waiting begins ...
[Galaxy S II Q&A, Help & Troubleshooting] abel06:
In my case, it's very simple.

With Dolphin, reboot in few minutes. Without Dolphin, no reboot at all!
[Galaxy S II Q&A, Help & Troubleshooting] The_IceMan:
Maybe a solution for the problem...

When i put my phone on the pocket with the top of the screen down sometimes it would make like reset and asked me my pin that's very bad for me because o need my phone to work..

I looked at the battery and saw that it has a small gap between the batery and the pins.

So i put some paper on the batery so it can be closer to the pins and it works!!

I think this append because of the SD card that pushes the batery away form the pins.

Just try ...

Hope i helped.

GRTZ
[Galaxy S II Q&A, Help & Troubleshooting] august66:
(warning: noob).

Have had my GSII for nearly two weeks now, no spontaneous reboots (none) in the first 11 days. Yesterday I did a factory reset, after which the phone automatically downloaded most of the apps I had installed before the reset. In addition, I installed Astro file manager. Since, it has done a reboot twice (slow ones, I suppose, had to enter my pin).

The only difference I can think of, is Astro file manager. All the apps were the same before and after. I have no SD-card in the phone. I figured Astro is a pretty popular tool, so I just wanted to let you guys know about my scenario, perhaps it could be of help.

Phone is standard yet Vodafone-branded, PDA:KG2/Phone:KG1/CSC:KE2.

Important addition: I noticed that the battery status screen shows that some time around the reboot (probably before:s), the phone signal bar was red. Safe to assume that means no signal? But that shouldn't lead to it asking me for my PIN, now should it? Judging by the lenght of the red part, I guess it must've been half an hour.
[Galaxy S II Q&A, Help & Troubleshooting] yeewensmc:
Hi i'm running the 2.3.4 XXKG6 which i just flash 3 hours ago, when my phone reached 30percent battery shown on my battery solo widget, the phone automatically reboot. Previously i'm using XXKG3 the phone will also rebooted. Dunno whether is the hardware problem or what. I've done a acouple of hard reset but still the same.

The battery graph also is the same like what u guys have encounter. Anybody can enlighten me ?
[Galaxy S II Q&A, Help & Troubleshooting] skartas:
Hello all. I had the same problem. It had nothing to do with software or firmware.

My battery was loose although it seemed tight. What I did:

Put a narrow piece of carton (thick paper) under the thin edge of the battery to push it closer to the contacts. And put a wide piece of carton(thick paper) above the flat side of the battery (almost the same size with the battery) just under the back piece.

No more restarts at all for more than a month :))
[Galaxy S II Q&A, Help & Troubleshooting] kanchiwij:
ANSWER!!?? certainly looks like

i think you've actually found tha source of this headache!!

usually my stock-sgs2 use to restart like 2 or 3 times/day, after jacking the battery no restarts for 2 days now..also i noticed battery drain graph is more gradual=bit improvement in time as well i think.

bad spot of design from samsung! sad..

Thanks skartas!
[Galaxy S II Q&A, Help & Troubleshooting] imran077:
I have been going bonkers with reboots and freezes and every time it does I would need to pull the battery out and wait 2-3 mins.

I tried every firmware. KH1 KH3 KG6 KE7 KDD but still the reboots

I installed KG1 and voila no reboots while using. As soon as i it goes idle and screen lock turns on it wud reboot in 5-10 mins.

If its a hardware issue than it wudnt run on any single firmware. But not every one is having this problem soo I am wondering wat exactly is the bug. Is it wifi, proximity sensor, screen lock, settings menu, TW4 widgets, wat exactly is it
[Galaxy S II Q&A, Help & Troubleshooting] crazyforatesla:
Samsung galaxy s2 random reboots

hi

i have a new samsung galaxy s2 which was originally from bell canada but was unlocked(by imei unlock i think) the firmware is stock

model number : GT-I9100M

Baseband version: I9100MUGKG2

Kernel: 2.6.35.7-L9100MUGKG2-CL371789DH130.YOO@SEP-48#2

my issue with this phone is that when im listening to music through the stock headphones via the stock music player it crashes, makes a sound while doung it. gives the media scanning on the bar on the top and the phone signal is not there.

i read from the other posts here that it may be from the sd card so i removed it but its still happening.

any suggestions?

thanks
[Galaxy S II Q&A, Help & Troubleshooting] schilling2k:
Hi,

yesterday i started experiencing the reboot issues when using the default music player on my SGS2. I never had this problem in the last 4 months since I am using this phone.

Whereas I sometimes - once a week? - had a problem where my phone told me that the SD card (Transcent 8GB) has been removed - even it was still inside the phone. I blamed it on the card itself and was planning to replace it sooner or later.

Like I said, as of yesterday, the new problem started. I read a lot of threads dealing with this problem and it seems as if I am not the only one. Here are some ideas and thoughts which could help to narrow down the source of the problem - if there is any specific.

Symptoms:

When listening to music - stored on the sd card or interal memory - using the default music app, the music suddenly stops after some minutes - doesn't matter if listening to one long track or short tracks , the screen turns on for a moment, the phone does kind of a reboot, plays the samsung welcome theme, comes back on after some seconds and does a media library rescan.

I don't have to re-enter the pin, but the screen is locked.

Thoughts and remarks

- I always used the "pattern (un)lock" feature of android for the lock screen and I recently switched to the "code (un)lock" feature

- When using the "pattern (un)lock" it seems to me as if I could listen to the music much longer

- When disabling these features - "pattern (un)lock" and "code (un)lock" I can also listen to the musc much longer without any problem

- I just removed the SD card from the phone and music is still playing after ~30 min. --> SD card issues after all?

I will keep you guys updated if there are any news from my side. I'd also like to hear from you if you have any suggestions or find a fix for this problem.

Best regards,

Daniel
[Galaxy S II Q&A, Help & Troubleshooting] heyumf:
Mine also random reboot dont know what is the problem
[Galaxy S II Q&A, Help & Troubleshooting] darkblade069:
Same problem here, my SG2 randomly fast reboot while listening music with the stock music app with mp3s on the SD card.
[Galaxy S II Q&A, Help & Troubleshooting] crik91:
Same problem with KI3(2.3.5), my phone rebooting when it's in standby...

Something about a fix?
[Galaxy S II Q&A, Help & Troubleshooting] geriguy33:
-Have you got an sd card in the phone? apps on the sd?

-Are you using DolphinBrowser?

check my thread:

http://xdaforums.com/showthread.php?t=1321612
[Galaxy S II Q&A, Help & Troubleshooting] ciprianruse:
auto rebooting

Hello!I have a problem whit my sg2.it auto reboots randomly whit no pattern at all(wille calling,entering app menu etc).I'm instaliing everyday a new ROM in the morning...the phone works perfectly untill the next battery charge,after charging in a hour or two the phone star rebooting again.I don't know what to do.Can anyone help plese?:confused:
[Galaxy S II Q&A, Help & Troubleshooting] fauzi_91:
mine done hv that issue
[Galaxy S II Q&A, Help & Troubleshooting] slabster025:
i experience random restart but i dont know which causes it

and when it restarts, the battery level becomes 25%

i remove battery for 2-3 mins and battery goes up, i left alogcat running one time but device did not restart so i really don't know

:(
[Galaxy S II Q&A, Help & Troubleshooting] gingo83:
GS2 autoreboot

I have that problem to.. Android v. 2.3.5 Gingerbread Stock kernel.

I wonder if its a auto-update of app problem? I noticed that after a autoreboot, "autoupdate" have the longest active-time in active programs list..

Witch is not the case if I manually reboot it.. hmmm.. very strange

Now I will try to go in to "settings", "about phone", "software update" and cross off all 3 active markers.. Lets see if that will do any changes:confused :confused:
[Galaxy S II Q&A, Help & Troubleshooting] gingo83:
This is very much what I have noticed to.. After a unwanted autoreboot, I see that "auto-update" has the longest idle process in the "actice programs" running!.. But this is strangely not the case every single time I reboot it manually.. Now recently I whent in to "settings", "about phone", "software update" and crossed off all 3 active markers.. Also I moved my background foto for the lock screen from my external sd to my root-DCIM. So far so good, but lets wait some longer time to really see if it helped anything.

I also think it´s important, to leave the phone alone as much as posible, when charging.. Like I think it´s important to FULLY diss-charge and charge the battery. Specially when the phone is brand new! Dont know very much about android, im a former windows-phone user, but I do know a bit about batteries and samsung phones.
[Galaxy S II Q&A, Help & Troubleshooting] randomA:
so hasnt this problem been solved yet?

i'm quite frustrated. my sgs2 reboots in a total random way.

at first it did very often even when i was having a call: i read somewhere to not install apps on the external sd as it would cause reboots, so brought back all the apps from the external sd back to the internal one. problem got solved for a while.

after a couple of days however the phone started randomly rebooting, frequency is still currently once or twice a day on average. strange thing is that it self-reboots -as far as i've noticed- only when it's idling on the table. sometimes im not even aware of it as it would just reboot by itself while im not using it.

i cant believe samsung isnt aware of the problem and has no fix for this.

my phone is standard rom but rooted, android 2.3.5, version xxki3.
[Galaxy S II Q&A, Help & Troubleshooting] flip00:
Nothing???

My Gs2 reboot in standby mod,i dont know what cause this but i need to solve it!!
[Galaxy S II Q&A, Help & Troubleshooting] Noghar:
SGS2 Reboot problem SOLVED?

I am convinced it's a fault with the battery.

I have been experiencing this spontaneous reboot problem for a while and could never figure out what was causing it - a rogue app or firmware bug? I am using a stock unbranded SGS2, not rooted or flashed.

Day before yesterday the problem got worse than ever, shutting down or rebooting almost every half an hour.

I recharge my phone every night but always carry a spare battery too, a non-Samsung one. Because I recharge my handset every night sometimes I go a long time without swapping the batteries. When the problem got so much worse, on an instinct I swapped out the OEM one for the cheap clone battery bought off Amazon. Reboots and shutdowns have stopped, period.

I know that the SGS2 batteires re not lumps of metal - they have firmware that controls their charging and discharging so they never go completely flat, which damages them. Seems to me a problem has developed with the OEM battery firmware - which no repair facility will ever find, because when you send your phone in to be repaired they always (?) tell you to keep the battery!

I am pretty sure this is right and I hope it helps someone. I am going to post this info wherever people are moaning about it - I haven't seen it named yet as a theory.
[Galaxy S II Q&A, Help & Troubleshooting] catolh:
I have had this problem with most of my android devices, and i have found that if i was in an area with bad 3g coverage, my phone would switch back and forth rapidly between 2g/3g, and this would ultimately result in a crash/reboot.

If i set my phone to only use 2g in bad areas (such as where my house is) it would solve the reboot issue.

The U8800 was especially bad, but the sgs2 handled it better. But still, both devices will eventually reboot.
[Galaxy S II Q&A, Help & Troubleshooting] b166er:
Dunno if this helps at all, but I rooted my phone 2 days ago with XWKK2 and then enabled SIP by following the instructions here

Since then, the phone fast reboots periodically.

I'm going to remove the allow SIP over 3G modification from the res-framework.apk and see if that stops it.
[Galaxy S II Q&A, Help & Troubleshooting] joefez:
I have been following this thread with some interest after recently getting my hands on a mint condition, second hand SGS2 from CEX.

It came with 2 x standard batteries (probably by accident) and I brought the official Samsung 2000mah to keep me going on my weekly commutes.

About a week or two after getting it, I rooted it (CF Root) with no problems, then a few days later used odin to put the old bootloaders on so I could reset the firmware count using a Jig. Pretty much after doing that I got my first random 'quick reboot'. Thinking it was maybe linked with the old bootloaders, I put the new ones back on, but the phone did another quick reboot later on that day. After a quick google I came across this thread and have been trying to pin down what the problem might be based on the reports back from everyone.

Unfortunately my testing time hasnt been long enough to point conclusively to an answer, but I have yet to get a random reboot off the extended battery, which seems to confirm Noghar's theory posted above. However, I do find it hard to believe my 2 x standard batteries are shafted, unless there is an issue across the board with the standard battery. I've labelled both my standard batteries to help keep track of the issue and it is usually when my 'A' battery is in that it happens, though I have had one random when using 'B'.

As I've got spares, I almost always charge my batteries in the official Samsung cradle charger rather than charge the phone directly. I've noticed that the random reboots tend to happen not long after either of the two standard batteries have been swapped out for the other. Like everyone else, the reboots come when the device is idling in the cradle or in my pocket.

To throw more variables into the mix at least one of the reboots happened during or just after an auto-update, as when the home screen came up I had two ticks in the status bar to show packages had just been updated.

I'm using the Elixir 'uptime widget' from the market to check if I'm getting reboots while I'm away from my phone or overnight, but as I mentioned before they always seem to come within a few hours of swapping the batteries over.

I'm just considering my next move. It will either be to keep the extended battery in for a week or so and charge the phone directly and see if it reboots at all. Or buy an Anker 1850mah extended battery and put that into rotation with the samsung extended to see if the problem goes away. I'll keep you posted with my results.

I should probably add I'm on a stock XWKJ3 kernel
[Galaxy S II Q&A, Help & Troubleshooting] joefez:
Update:

Ok, after another week of tests I can confirm that in my particular case it doesnt seem to be the batteries themselves that are causing the reboots.

I managed to borrow an Anker 1950mah battery off a friend and just used that in rotation with the 2000mah extended. I've just had a radom reboot off the extended battery after 6 hours (of putting it in). I doubt 3 different batteries can all be causing the same problem.

Strangely enough if I just keep one battery in all of the time and charge it in the phone I dont seem to get random reboots. I've had about 3 days of uptime without a reboot, whereas swapping the batteries over daily pretty much guarantees a reboot once a day.

Over the last week I have also performed a full wipe via CWM and flashed to Checkrom 4, which hasnt sorted it out either.

So the question is now, send it back for a replacement or just accept it is a quirk of the system? Has anyone else had any experiences, fixes or has sent one back for repair yet? This thread seems to have gone quiet but I cant believe I'm the only one still with this problem?
[Galaxy S II Q&A, Help & Troubleshooting] randomA:
reviving this thread because at this point i have no more ideas on what to do....

this is unbelievable

although this app is quite useful to track down reboots, it's useless for troubleshooting as it doesnt say WHAT causes the reboot. do you have any alternative to it?

thank you ~
[Galaxy S II Q&A, Help & Troubleshooting] joefez:
After posting here I came across another thread that seems to have been running for some time but is slightly more active

http://xdaforums.com/showthread.php?t=1102920

There's 20 pages and whilst you should definitely read it all, in summary it seems to boil down to this:

1. Wifi (on = reboots, off = stable)

2. SD Card (various capacities & speeds potentially causing issues)

3. Combination of the above

From the looks of it Android 2.3.3 was the last OS version without the issue. From then on, up to 2.3.6, people have reported random reboots. ICS beta's are also reported to carry the issue. Then again as the Galaxy Nexus running ICS was rebooting randomly from day one, I'd say this is an ongoing problem that Samsung must be well aware of.

I'm just going to try running on mobile data for a few days and see if that cures it. I've tried near enough everything else.

I hope it is the OS and something that will be fixed with ICS. Coming from a ZTE blade having run through about 30 different roms over a year I've seen issues come and go before true stability was achieved. It's a shame most of the time it's up to the excellent developers on XDA to fix big manufacturers problems.
[Galaxy S II Q&A, Help & Troubleshooting] simplytimo:
SGS II random reboot

I just moved to SGS II less 8 days ago and I have been through2 sets and now on my thrid set.

First 2 sets randomly reboots and when I say random it is really random - i may be in the middle of a call or sending messages or just leaving the phone on the desk. It happens in the pocket too.

When I changed the SD card and insert the battery, the phone auto boot up without me powering on.

I suspect there is a problem with the battery.

I also noticed that the ear piece provided is not universal. I plug into my Xperia Arc S and it says 'Not Supported' and I plug into my SGS I, it was very soft.

The sets were bundled with some premiums from the Telco (leather case, Portable Battery Charger) and were white.

The exchange policy was 1 change within 7 days but they allowed me to change the 2nd piece. I guess there must be a reason.

The third set was a normal set and it has been up without reboot for the last 45hours.

I did not check the firmware of earlier 2 sets but the current one is KL3 with Baseband version KL1.

My friend with Galaxy Note also noticed auto reboot - just today after using about 10 days.
[Galaxy S II Q&A, Help & Troubleshooting] joefez:
@simplytimo: I've gotta say, I've used 4 different batteries, 2 x stock, 1 x extended (samsung), 1 x extended (anker) and got reboots on all of them.

I've also wedged all the batteries with plastic, tight against the contacts, and still no change.

Your situation may be different but I'd say in 99% of the cases the battery is not at fault: phone or os - os more likely.
[Galaxy S II Q&A, Help & Troubleshooting] digz6666:
I've been using Galaxy S2 for 7 months without problem, but after upgrade to 2.3.6 XWLA4 I got random reboot (crash) issue.

It's fine when I was on 2.3.5 XXKI4 (with ADATA 16GB class 10 micro sd card).

First I thought its related to SD card, so I removed the SD card but issue was still there, but rebooting less without SD.

Then I flashed 2.3.6 UHLB2 but random reboot issue is still happening.

What should I do? Flash back XXKI4 or wait for ICS?
[Galaxy S II Q&A, Help & Troubleshooting] joefez:
Try disabling your wifi and see if it still keep rebooting. I know this isnt always practical if you dont have a data plan but it should help you to pin point the issue. If it stops the rebooting, just try turning your wifi on only when you need it and then turning it off when you've finished. Not ideal I know, but I went from reboots once a day to no more reboots.

I think the reboot issue is linked to roms 2.3.4 > 2.3.6, but if you were running ok on 2.3.5 stick with it. I dont think 2.3.6 brings that much more to the table than 2.3.5. Saying that I wouldnt hold your breath for ICS, even the betas are causing random reboots. Lets hope its fixed with the final version.

Check Rom v6 - CF Root Kernel - XWLA4
[Galaxy S II Q&A, Help & Troubleshooting] digz6666:
My Wifi is mostly disabled, I enable wifi when needed, then disable right after use.

It mostly reboots (crash) in following cases (on stock 2.3.6 XWLA4 and stock 2.3.6 UHLB2):

- unlocking screen lock (wifi disabled, with or without SD card inserted)

- listening music by stock player (wifi disabled, with SD card inserted)

- unlocking screen lock while playing music by stock player (wifi disabled, with SD card inserted)

- downloading game data by wifi (with SD card inserted)

As I remember it rebooted (crash) 2 times when I was playing Asphalt 6 Adrenaline on stock 2.3.5 XXKI4 with SD card inserted, but I never tried on 2.3.6.

So I think its not related to Wifi, its more related to SD card.

When I was on 2.3.5 XXKI4 and without SD card it was fine, but several days later I noticed that after inserting SD card my media scanner was eating battery, but it was working without rebooting (crash) for several days with heavy usage (playing music or unlocking screen lock).

So I updated to 2.3.6 XWLA4 and I got reboot/crash issue.
[Galaxy S II Q&A, Help & Troubleshooting] Honchay:
Take out tour SC card and try if it reboot...

another options are try changing your kernel to the popular ones like Siyah, Neak, RedPill... Or you can do a backup and try this:

-Wipe Data/Factory (You can skip this if you dont want to lose your data)

-Wipe Cache

-Wipe dalvik cache

In mount & storage

-Format data

-Format cache

-Format SD card

and restart. Restore your data and give it a try.
[Galaxy S II Q&A, Help & Troubleshooting] digz6666:
I flashed stock XWKL1 2.3.6 ROM and its working fine with SD card inserted.

My phone haven't crashed for continues 6h music play :)

Update:

Working for 30+ hours without rebooting :)