[Daynarr]

Another possible reason for random reboots can be power supply. Usually power supplys that aren't working properly or aren't adequate for you power usage are the cause. Memory would cause you frequent system freezes or BSOD, hardly reboots.
Sometimes it can be even memory conflict between applications or even some not-working-as-it-should application (betas can do that sort of thing).

However, since you experience it for a long time I'd say it's power supply.