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FP2 Android 9 Do Not Disturb keeps switching off

After the update to Fairphone OS 21.03.0-rel.2, Do Not Disturb keeps switching off automatically.
I select duration = until you turn off, but after one to a couple of hours it’s switched off again.

I didn’t change any apps after the update. Using Nova Launcher and Audio Profiles but I doubt those have anything to do with it, I didn’t change any settings in either of those before or after the update.

Any ideas?

Any alternatives? Maybe I should use the Audio Profiles instead?