It could be the PSU, that happened when mine was dying.
Download HWInfo or something similar and check the voltages
Computing
PC Randomly Restarts
Submitted by Moomin, 30-01-2018, 04:59 PM, Thread ID: 72309
Thread Closed
RE: PC Randomly Restarts 02-02-2018, 06:34 PM #9
02-02-2018, 06:34 PM
#9