The problem is that the culprit is very much system dependent and it's hard to diagnose from distance.
In my case the symptom was that in Falcon (and only in Falcon) randomly I suddenly get a reboot in the middle of a flight, without warning or messages, no help by Windows events messages.
Then I followed the usual annoyng routine,: checking RAM, checkdisk HDs,monitoring temperatures, power supply, reinstalling, and finally, if no solutions, buying new hardware.
Luckyly I solved the problem.
In my case , it was an Trust UPS 800 that probably was too loaded.
I mean , the UPS has 3 electric lines out connected/protecting PC , monitor and the third ALL other numberous devices: it worked for some years, but after having completed all HW checks with no results, my last resource was suspecting the UPS.
Then I left only the connection to PC and took out the others : it worked.
In an other case happened to my Wing's mate, same symptoms, but the culprit was a defective Power supply.
Moral is that , if all usual HW checks give no results, your attention should go to your own Electric Power chain: also a defective cable, or the short distance beteween UPS and PC, can be the cause, but these are just examples.