Hello, you should clear the wipe cache after every major update. Similar to Windows the old Windows installation after an update. This can prevent such problems:
Wipe Cache Partition (Note10 and above):
Turn off the phone》Connect the device with a charging cable to a PC/PlayStation or TV》Power on/off + volume up button at the same time until a menu appears》Use volume up/down buttons to go to the "Wipe Cache" item. Press Volume Up / Volume Down buttons to navigate to "Wipe Cache Partition"》Press Power button to confirm》Navigate to "Yes" in the submenu and confirm》On completion of the process, navigate to "Repair Apps"》Press Power button to confirm and allow phone to boot up
This process only deletes remnants of the old operating system and cleans up system junk. Personal data will not be lost.
Of course, the problem could also be an app, but this happens relatively rarely.