Question pc crushing

Mar 26, 2019
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hi guys,not long ago just build up a new pc here's the rig:
cpu-AMD Ryzen 5 1600
motherboard-MSI B350 Gaming plus
RAM-corsair vengeance pro 3000 Mhz, 16gb
gpu-Asus co ii gtx760
PSU-pulse 750 w
the system it's not overclocked all standard settings,everything was runing smoothly ,now for the last 4 weeks i can't play any games ,soon as i lunch the game screen comes black and pc restarts by itself,my little girls was trying to play roblox,desame issue,game is loading then pc restarts by itself,anyone any ideas why is doind this ,
drivers all up to date,byos up to date,ram module checked both individualy, power supply 750 watts,also i've noticed the pcu fluctuate up and down from 3200 mhz down to 1600 mhz
 
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