Hello, firstly I'd like to start off by saying I hope I've posted in the right category
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More aboutshuts play video games
First, download Speccy and post a picture of your temperatures while you play a game.
A lot of times that is the power supply or heat but you need to list all your PC parts.
I think the psu is starting to fail. The first thing I would do is get a can of air and blow out the psu and your cpu heatsink nice and good. See if the problem still happens on high power draw. If it does time to change your power supply.