NewtownSmartlearn mine were weird issues.
- VoLTE/VoNR was disappearing after waking phone from sleep.
- Status bar showed ‘Emergency Calls Only’ in full coverage area.
Was missing calls because of these two.
One extra thing that I have seen across all android devices that might help someone with ‘unwanted battery drain’:
This will be additional steps, but, after every OTA update:
- Take full backup of your data
- Do a complete factory reset
- Restore data
Above steps will surely fix battery drain issue.
