@louiscouture How old is it and where does it live? I see this behavior on older machines that have bad fans, dust, or other heat related issues. Check both the CPU and GPU fans and heat sinks. Also because it is an easy thing to fix, check the condition of the bios battery anything below 3.05v is suspect.
@louiscouture Well, so much for that idea. I haven't seen a new system since 2018.
@antares It was only a few months old