I was able to reproduce this on elementary OS 6.1 (kernel 5.13.0-52-generic). It's based on Ubuntu 20.04 LTS, which I've used before without issues. Again, the system was idle when it happened, but it's very random and I still can't intentionally reproduce it. I'm disabling some power management features in the BIOS UI to see if they make any difference. A BIOS downgrade should be worth a try.