PC restarts randomly

[Windows 10]

I don't remember when it first started happening but today, I was just watching a video and it randomly restarted on its own, no warning or anything. Other times, I was playing Valorant and all of a sudden it crashes and in order to play again I have to restart the whole PC by pressing the power button or letting it crash and restart on its own. It's very frustrating that I can't figure out what the issue is.

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