Do not disturb

[JS1864]

I have an s22 ultra and recently I've noticed it behaves as though DND mode is enabled (no sound alarms or notifications between 11pm and 7am). I have never enabled DND, it is currently saying 'off', there is no schedule defined, and yet... no sound over night. Any ideas?

[JS1864]

There was a one ui 8 update. I'll give what you suggest a try. Thanks

[Bindex]

If that doesn't fix it, I would then suggest clearing your device partition. I'll put the step below.

To clear your phone's cache partition:

1. Connect your phone to a PC.
2. Turn off your phone (it won't enter Recovery Mode if it's on).
3. Press and hold the Volume Up and Bixby/Power keys simultaneously.
4. Once the Android Recovery screen appears, release both buttons.
5. Use the Volume Down button to highlight "Wipe cache partition."
6. Press the Power button to select it.
7. Use Volume Down to highlight "Yes," then press Power to confirm.
8. After the cache is cleared, press the Power button again to reboot your device.

[JS1864]

Already cleared the cache partition

[TJ51]

I recently spent 3 hours trying to fix the same issue, they finally had me do the following and so far it has worked.

Access Settings
From a Home screen, swipe down and tap Settings
Navigate to App Preferences
Tap Apps
Reset App Preferences
Tap Reset App Preferences

I hope this helps you.

[JS1864]

Well that seems to have worked! I did have to spend an hour or so giving everything the right permissions again, but it's working again. Huge thanks.