Wow! I just got a "fatal error in execution unit" bug in my CPU that rebooted my machine and displayed the error in UEFI after reboot (but so quickly I coudln't read it all).

Computer is not running hot, has over-the-top cooling, is not overclocked, was not doing anything at the time (not compiling).

AMD Ryzen 9 5900X 12-Core Processor.

The screens went blank and then a short while later "beep" it was rebooting.