Unfortunately, spontaneous freezes/reboots point to problems with the mainboard. The driver might be able to crash the OS/kernel but it shouldn’t be able to crash the board.
Also, it’s impossible to debug these kinds of things if you’re not the mainboard/bios manufacturer.
Similar case, different board:
https://forums.developer.nvidia.com/t/kernel-5-4-and-5-6-not-4-19-full-system-freeze-lockup-when-playing-back-video-gtx-1660/120308/2