Question Computer random shutdown (first pcbuild)

[Baretk]

Hello people,

So i thought i would build my own computer to save some money. I build the pc and everything worked perfectly. I checked all temperatures and clocks, everything was fine. Then after some time the computer started shutting down without any warning. No BSOD and nothing showed up after i got the computer to restart again. After the computer shuts down i can't start it up with the power button. I have to switch the power supply of for at least 3/4 seconds before switching it on again. Most of the time the computer shuts down after a second. Sometimes it just starts to work, and will work for hours or sometimes even days without a hitch.

My components:
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Corsair Vengeance LPX - Geheugen
Samsung 970 EVO 500GB M.2 - Solid state drive
AMD Ryzen 5 3600 - Processor
Gigabyte GeForce RTX 2060 Gaming OC Pro 6G - Grafische kaart
MSI B450 Tomahawk MAX - Moederbord
Corsair TX-M Series TX550M V2 - Voeding (intern)
Corsair Carbide Series 275R TG - Midtowermodel

What i tried until now:
*Checking if any cables are loose
*Updating the motherboard
*Check bios settings (XMP is on)
*Check the temperatures
*Nvidia and MSI drivers are up-to-date
*Launched Cinebench (max CPU temp. 60)

Thanks for reading and i hope we can come to a solution.

 

[Baretk]

So, no reactions but i have been busy. One constant factor in the shutdowns has been found. As soon as i try to put the computer on sleep mode, it shuts down and after i try to restart it the computer fully shuts down.

So i can restart the compuer without a hitch, but when i try to put it in sleep mode it shuts down.

The memory has been changed, no result.