I've experienced problems with endless lags and the spinning wheel with Mail (when trying to quit), Safari (when trying to open a new tab via keyboard) and other apps when trying to quit and also when trying to start them. The issue is really annoying since the only solution seems a long press to the power button to switch off the unit. The update to 11.2 and 11.3 beta didn't solve the problem. Sometimes the problem disappears for several hours and then returns again on both my iMac 2019 and my MBP M1 2020.

The same here. I've experienced the same problem with Mail (when trying to quit), Safari (when trying to open a new tab via keyboard) and other apps when trying to quit and also when trying to open Mail. Maybe there is a problem with the finder. The update to 11.2 and 11.3 beta didn't solve the problem. Sometimes the problem disappears for several hours and occurs on both my iMac 2019 and my MBP M1 2020. The issue is really annoying since the only solution is a long press to the power button.