For the other folks who are having this issue; are you running Apple Factory SSD's ? Or OWC Auxa X2s? or other 3rd party brand NVME's via similar adapters?
Is your Big Sur install which
doesn't crash updated to 11.6.1? Does the crash log give an MCA Error? I have had this start to occur on Big Sur but only recently since the 11.6.1 update and as per your note, not every day.
I'm running a third party 2TB NVMe drive with similar adapter.
Others seem to say the same in
this reddit thread regarding 11.6.1, and also the crash being persistent even after downgrade all the way back to High Sierra - so maybe it relates to the bootrom update that was included with Big Sur 11.6.1 and Monterey? (11.6.1 updated it to 429.40.7.0.1). No mention of SSD vs NVMe etc in that thread.
Same MCA Error mentioned in
this macrumors thread, with reports on it being present with an OWC Aura Pro 2 SSD. But I would be keen to know if anyone getting these reports are using the stock Apple SSD.
In the above linked thread,
@tsialex touched on a potential power related issue - might be related if all these reports are for machines using potentially more power hungry NVMe's?