Question New computer reboot during games ?

Feb 16, 2021
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I have almost new build computer, that 19 of 20 times crash (reboot) when I start fortnite, sometimes after 1 second, sometimes I got to the menu before it crash,
First I was thinking thats its someting with fortnite, because some other games, like cyberpunk works.
But now I tried Apex, and it does also crash.
And its not only the game that crash, its the computer that reboots.
I have tried re-install windows twice, not helps.
I have the newest drivers for CPU and GPU.
I tried to swap Ram memory, only have one memory, dosent help.
I have been checking temperatures and it seems fine.
So if anyone has some tips I would be happy
I have tried stress-tests without any problem
My specs are:

Processor
AMD Ryzen 9 5900X 12-Core Processor
Manufacturer
4.8 GHz
Memory
RAM
32 GB
Video Card
AMD Radeon RX 6800
Dedicated Memory
16 GB
Total Ram Memory
32 GB
Power supply 750W
BIOS-version American Megatrends Inc. 2606, 2020-08-13
Motherboard PRIME X570-P
Harddrive
Modell WDS100T3X0C-00SJG0
Operating System
Windows 10
 
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