Which carrier SIM are you using? Is this related to which network you use? Both WiFi and Mobile data?
In release notes, it seems to mention improved system stability. It's worth to try 10.5.9.
10.5.9 is released and it fixes system stability issues. It's worth...
May be you can check there is any abnormal app consumes more power, it would be more clear.
May I know which Custom ROM work? Is it also integrated Google discovery in minors one page?
Have you downloaded any message apk from any web sites before you upgrade to the 11?
Which SIM cards do you use?
Which SIM card do you use? Vodafone?
What's your second SIM which might cause this issue? Vodafone?
Which version of google play do you have?
Are you able to post the screenshot in which you see this issue - (The lock screen UI you mention)?
There should be one exit button there and you...
Looks like your google play service also cause the battery consumption, have you upgraded to the latest version?
For those people who have battery drain issues, it is better to check whether your Google Play Store has updated to the latest version: 22.1.18-21。...
Google play store has some known issue which would cause battery drain.
It's better to upgrade to the latest one : 22.0.16-21
This might be the temporary solution before the fix. You can try it.
You can try to disable message classification first.
SMS App> Settings> Uncheck Message Classification