Do you want to look for something in common? For example, @dupdob, is yours also an Intel Mac with T2 chip?
1. Yes, I do have a late 2020 intel MBP, with T2 chip.
2. I did what I said: backup and reinstall. But I did a reinstall as new and pulled data back manually, IIRC.
The issue never occurred again.
Sorry for the late reply. I just got a notification saying there responses on this thread. And I see there have been a lot of activity here.
Note sure why I did not get any other email notifications.