[Galaxy S3 Neo Original Android Development] helloyello:
Some updates on the LOS16 BT issue and general experience (battery usage / WiFi Signal).

On the BT issue:

- I'm usually speaking on the phone for around 1-2 hours a day and there are many short conversations

- it's only seldom that I speak more than 20 minutes

- the BT issue (loosing the microphone input) seems to happen between 20-30 minutes during the call

- I started to consider that this could maybe be caused by some data traffic restrictions. These data restrictions available in the newer versions of Android were new for me, last Android I had a lot of experience with was KitKat (4.4)

- went in the Apps > Phone > Data usage and enabled "Unrestricted data usage"

- it looks fixed now (workaround), it doesn't happen anymore, but I'm only 99% sure

- see the screenshot for the Phone App settings:

https://imgur.com/a/4Dflrmg

On the Battery Usage reports and difference to stock ROM:

- I read some recent reports in this thread that the LOS16 is depleting the battery faster than stock ROM, on which I also agree.

- it looks like I'm also loosing 25% of the battery duration with LOS16, compared with stock ROM

- some details on the phone configuration/usage under both LOS16 and stock ROM:

1. always staying on 2G and only switching to 3G when mobile data is required. Under 2G standby, the battery (mobile modem consumption) is drained very slowly, whereas on 3G, due to the bad coverage, the battery is consumed way faster

2. I'm aggressively greenifying unused apps - camera, calendar ... etc, everything that isn't needed under standby (around 20-30 apps, including system apps)

3. under stock ROM, averagely, I was speaking on the phone (2G) for about 1 hour a day, on messenger Skype/Signal another 30-40 minutes and used the WiFi/mobile data and Firefox for 15-20 minutes. Average speak time on phone 4 hours, messenger 2-3 hours and browsing + screen on 2-3 hours. I usually recharged the battery every 3 days. I also used the phone to browse the internet (Firefox) and also watch youtube (inside Firefox) on several occasions, and the battery - starting from 100% charge - was holding on average 4,5 hours - Screen On + WiFi + OpenVPN + Firefox

4. under LOS16 I'm doing the same as described in the point above (3.) but it looks like the battery endurance is 75% in comparison. Even the Screen On + WiFi + OpenVPN + Firefox starting from 100% battery charge , holds only around 3-3,5 hours. I need to recharge the battery every 2 days now.

5. there is also a statistics/usage issue in LOS16. Once the battery is 100% charged, I unplug the charger and perform a reboot (just to make sure deep sleep is enabled). After the reboot, the battery drains around 15% very fast (5-15 minutes) in sleep mode and then it stabilizes at 85-87%. Then, when it reaches 15%, if I'm using the phone, it drops very fast to 1% - in minutes (maximum 5-10 minutes). This is not happening in stock ROM. Actually, in stock ROM, I loose around 4-5% very fast, in sleep mode, after I recharge the battery at 100%, but it stabilizes at 94-96%.

See the screenshot:

https://imgur.com/a/RZeqvEA

There were some recent reports here that the WiFi sensibility (reception) is worse compared to stock ROM and I can confirm that, at least on 2,4GHz I also noticed a 15-20% drop in signal quality. Tested with some diagnostics apps on the phone and also observed it in the OpenWRT graphs on my router.