Turn off always-on display for a couple of days and check if any improvements. If the issue is fixed then maybe a recent update caused the issue. Try to roll back or wait for the next update.

I think you would get it by mid march.

I received Feb 1st 2022 update 2-3 days ago on my samsung s20. The updates are in timely manner for my phone

Not sure.. did you register for samsung beta program (android 12)?

Not sure about network issue but for battery draining try below workaround:1. Disable always on display (AOD)2. Turn off charging status on AODThis is a workaround until samsung fixes the issue in stable release