PC randomly resets

When Only playing Lost Ark it was fine for the first two days but now when I play after a minute or two the PC switches itself off… I’ve tried updating Bios, all drivers and checking the game files through steam and still happens. Can’t seem to play at all. My PC specs are

8 Core LGA 1200 3.80GHz CPU Processor
Motherboard Intel Z490 A Pro
Memory/RAM 16GB DDR4 3600MHz
Cooler Tower Air Cooler
Secondary Storage 2TB HDD
Graphics Card AMD RX 6700 XT 12G
Case ATX Case
Power Supply 750W 80+ Gold
O/S Windows 10 Home

Any help or advice appreciated

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