[Xperia Z Q&A, Help & Troubleshooting] QualQuek:
According to the thread on the Official Sony Support Community by Lemon and updated by me, Here a thread trying to list all troubles on the 4.2.2 Official Update.

If you're using a custom ROM do not list your problem here because that can be specifically a problem on your ROM.

Gracenote Update

I had approxamitely 3200 songs in my library. I attempted to update the artwork and music info using the integrated 'Download music info' option (powered by Gracenote). This repeatedly fails and crashes, and somehow managed to wipe approximitely 40 artists from my library of 150 artists. I now only have 108 artists, and have lost a lot of music, which I had paid for or ripped from CDs. I now have to do rip these all over again, and I've also wasted a considerable amount of money on MP3s which have now been wiped by shoddy software!!! I just tried to update some more files, just this moment, and while it managed to update beyond 82/800 tracks, it then failed and gave me a 'Network Error' and advised that 2 tracks had been updated - despite that it had already attempted to update more than 82 tracks!!! It's massively buggy. Not going to use it anymore in fear that it wipes more of my library.

Walkman App

Sometimes shows '-1' artists in library. When tapping into the Artist list and coming back out again, this updates and shows the correct number of artists. Why would it EVER show that I have '-1' artists in my library?!?

Android Become Slow

I've had it after the update, if you feel that your android is very slow since the update, just go to the settings, select applications and "desactivate" some useless app that eats memory, be carefull what you're desactivating, you don't need to be rooted for doing that, that helped in my case.

Earpods/Headphones Compatibility

My previous handset was the 2011 'flagship' Xperia Arc. The stock headphones which came with this handset are of a much better build quality (and tangle a lot less easily) than the stock headphones which came with the Xperia Z. However, upon connecting the Xperia Arc headphones to the Xperia Z, I get a message saying 'Headset not supported. Use another headset or visit the Sony Mobile support site for more information'.

Many earpods/headphone seems to not be supported anymore under this update, Sony needs to fix that quickly that's really annoying.

XDA Threads : http://xdaforums.com/showthread.php?t=2340877

http://xdaforums.com/showthread.php?t=2355500

MBS-100

Everytime I connect over Bluetooth to my MBS-100 (first generation) my WiFi crashes after about 4 minutes. Every time. This does NOT happen with my MBS-200. Seems Sony haven't put enough effort in testing support for their older devices/products, this is clearly also the case above with the stock Xperia Arc headphones.

SD Card bug surfacing

The Sony Xperia Z is suffering from a persistent hardware failure, which is inserted SD cards unusable. Most of time we need to reformat/restore it and in worst cases the SDCard is dead and you need to buy a new one.

I have this as well that asks me many times to check and verify my SDCARD when i use the MSC connection, if i don't do it i can't copy files on it.

XDA thread : http://xdaforums.com/showthread.php?t=2352245

Photo Album uploading with Facebook for Xperia

Tried uploading 31 pictures using the integrated share to Facebook for Xperia feature last night, on a FAST connection (Download Speed: 44.9MBPS / Upload Speed: 7.4MBPS) - 1 picture uploaded, service failed. Tried again, 2 pictures uploaded, service failed. Tried again, notification said 'Uploading pictures for about 18 minutes, before timing out and failing without uploading any pictures. Any pictures that did upload, did not upload in order either. After repeatedly attempting this about 30/40 times, I managed to upload about 17 of the 31 pictures, and had to connect by USB in order to do the rest. Seems like this feature was slapped on without any REAL testing by Sony.

Lockscreen Bypass

It is possible to bypass the lockscreen by typing '*#*#7378423#*#*' and doing an NFC test in the Service Tests menu (http://www.youtube.com/watch?v=LLq1gxIt5YQ) - this renders the handset COMPLETELY UNSECURE.

XDA Thread http://xdaforums.com/showthread.php?t=2206033

Socialife

Never updates automatically. Sometimes updates manually. Sometimes doesn't. Just tested manually refreshing this moment, today being March 26th, and nothing is showing beyond the afternoon of March 25th.

Stamina Mode / Battery Life

When first experiencing issues with my handset, a Repair was advised by support staff on the forum here, and official Sony Customer Support Staff. Following this repair, by battery life at 100% showed 4 DAYS AND 12 HOURS. A week later, on 100%, my battery life dropped to 2 DAYS AND 8 HOURS. Another week later, on 100%, my battery life is now showing 1 DAY AND 1 HOUR. All of these figures are with Stamina mode turned on. I haven't added anything to the handset to affect performance, it's simply degrading of it's own accord. Which makes me wonder why the support staff repeatedly assure us on these forums that 'the battery life will improve after a few charging cycles' - this is not the case, and there is CLEARLY a Power Management issue, which needs to be resolved.

LED Notification

Fortunately, I am not experiencing the LED issue that others have been. But it should be listed as others have been experiencing it.

Sleep of Death

Fortunately, I am not experiencing this issue. But it should be listed as others have been experiencing it, special mention for people who hard-bricked their phone, do not include that problem.

WiFi Signal Issues

Fortunately again, I am not experiencing any major WiFi issues. However, when uploading photos using Facebook for Xperia last night, it knocked off my WiFi twice for no reason. And I've also documented my WiFi issues in combination with Bluetooth to MBS-100 above.

Accessories

The 2011 flagship Xperia Arc came with quality headphones, a charger, and a mini-HDMI to HDMI cable for outputting to HDTVs. The 2013 flagship Xperia Z came with cheaper headphones, a charger and NO cable for outputting to my HDTV. I expected this to be included in the package, given the lofty pricetag, but now I realise I must go and buy an 'MHL Cable' - something I didn't even know existed until after I purchased the device. Thank you for not including this cable Sony.

If anyone has any further legitimate bugs/issues to add to the list above, let me know and I'll keep the OP updated.

If you know a fix i'll add a green comment.

Severity color :

Low

Medium

Critical

Fixed