pc random turns off and reboot itself

[syfer]

Hi so today the computer turned off totally for 2 seconds it turned back on and rebooted by itself. Specs are

AMD Ryzen 5 3600 Processor (6C/12T, 35MB Cache, 4.2 GHz Max Boost)
ASUS TUF Gaming B550M-PLUS mATX AMD Socket AM4 Motherboard replicated from box.co.uk from ASUS
Arctic Freezer 34 eSports Edition Heatsink & Fan Black & White Intel & AMD Sockets
PowerColor AMD RX 580 8GB DDR5 RED DEVIL Graphics Card Gaming Version (AXRX580 8GBD5-3DH/OC)
Kingston KHX3600C18D4/16GX 4 Sticks 64gb total
Intel 660p M.2 2280 512GB PCI Express 3.0 NVMe Internal Solid State Drive Rev:4.00 (OS DRIVE) (2019/08/09 sticker date) 
Corsair CX550F RGB
ASUS BIOS Version 3205
16 MB
2023/09/04

Now the only thing that was replaced was a replacement mothered sent via box.co.uk to me as the last one stopped working and this was replicment from ASUS. Now second time it's done and I have an idea why.

Everything seems until it decides to power down, wait 2 secs, and turn all byself I have no what to do......

 

I am running OS Name   Microsoft Windows 10 Pro
Version 10.0.19045 Build 19045

 

Any idea 

The event viewer log can bee seen here at 

https://mega.nz/file/Vysg1TpJ#dcOoBq8H8Kl_igpw0X66zzgdP6aLEsooSdNW4EUE2rI

and i have no cloe whats going on.