What can I do to stop my PC rebooting when playing valorant?

[Windows 10]

My PC started to crash and reboot when playing Valorant. It hasn't happened for other games but my whole PC crashes back to the passcode screen. What can I do to stop the rebooting? I've checked device manager and it says the graphic drivers are up to date. I've repaired corrupted game files in Riot Client but my PC continues to reboot.

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