PC crashing playing GPU demanding games (possibly PSU related???)

[Guest Solarei]

I built my PC last year and it has been working fine until last month early October.My PC will sporadically crash when playing games. Sometimes when starting a game up, sometimes after a few minutes/hours of playing, sometimes it won't crash at all for that day but then crash the next day when I try to play again.When playing a game, my monitor will lose signal (goes black), but the RGB lights on my PC stay on and background audio will still play (if I'm in Discord VC at the time, they can hear me for the time frame between lost signal and PC restart). After a few seconds, my PC restarts by it

 

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