All - I have not faced the issue since the last 9 days!, so I'm somewhat hopeful the issue may have got resolved for my Iphone 13 Pro on iOS 16.1
Steps that I took:
- Removed the Company management profile (for my office mail) and also removed any third party keyboard ( Swiftkey)
- Connected phone to iTunes on my Windows laptop
- Backed up everything relevant (I usually back up Photos in Google Photos and use iCloud for Whatsapp, contacts, messages and general device settings)
- Clicked 'RESTORE' (which is similar to a factory reset) from ITUNES on my laptop
- When the phone restarted, I manually set it up. DO NOT SELECT THE OPTION TO RESTORE APPS AND DATA FROM A BACKUP OR ANYWHERE ELSE when you're prompted for it.
- After the full setup/ restart, MANUALLY INSTALLED all the apps again
- (Basic data for Contacts, Calendar, etc. automatically got updated from iCloud backup)
- (Whatsapp data was restored by going into Whatsapp and clicking the appropriate option).
Since then, 9 days have passed without the issue. Today, I've reinstalled SwitftKey and will see if it causes any issues. After 1 week of no issue, I'll also reenable my office email by accepting the management profile/settings.
Others - Do try the above steps and share your experience.