Hi.
In march I finally managed to get the thing going, and was super exited and did quite a few jobs with it, then for the last month and a half, I was stuck with some other things and did not touch the cnc, and last week had in mind to get back to it, only to notice that the pc (gigabyte ga-8vm800pmd-775-rh, ddr2, 533mhz) which worked perfect for some time, including 10 hour straight in some cases, now turns off without notice. I did not change anything to it.
The workshop is a bit dusty, but its enclosure is mostly sealed,and the little dust that gets in through the fan holes, I blow it away with the air compressor (from a distance and gently) every week.

I did not manage to install the windows on an ssd for this pc, so I just cloned the one it had (win xp, sp2? - very old, does not receive an antivirus) on its hdd, and changed the ram memory, and it worked fine. Until now. It just turns off, randomly. No error apears, nothing, sometimes a few times a days, or a few time per hour. Any ideas what could be?