Custom build. Computer was running fine for about 2 years. No updates or driver changes that I'm aware of, no major software installs or any installs really that I can think of.
One day it just froze after about 30 minutes, the mouse moves on the screen and the waiting cursor goes up like it's working. If I leave the computer on it goes to BSOD after about 5 minutes of this.
I ran memtest, no errors in the RAM. Left on performance monitor and the temperature and memory usage were fine, nothing out of the ordinary like a runaway program. Virus scan appeared clean. If I turn the computer off after a while and then back on, it will go for another 30 minutes no problem, but I noticed if I just restart it doesn't seem to work. I haven't timed it I don't believe it's an exact 30 minutes, around that time frame though.
I'm not even sure what to try anymore....
Update: temp monitoring does not show any abnormal temperatures. I confirmed by running 3dmark benchmark, no issues. The computer will freeze under 1% load and at 40 degrees. I can run 3dmark for 20 minutes, turn off for 1 second turn back on, then run it again and have no issues, but if I leave the computer just turned on with nothing running it freezes.
I will try reseating RAM and getting the BSOD error.
To make it clear, when I said turning off the computer helps, I mean I can power down for 1 second and then turn it right back on and it doesn't misbehave.