Computer freezes for no apparent reason

[Asgardvds]

Power Unit:Xilence XP600R6 600 Watt Netzteil (80+)
Mainboard:Gigabyte GA-970A-DS3P FX
Processor:AMD FX-8370 8x 4.3GHz
Cooler:Xilence Performance C A402
RAM:8GB Extreme DDR3 PC-1866
Graphics card:Nvidia GeForce GTX1050 Ti 4GB, Palit StormX
1. system drive: 240GB SSD
2. Game drive: 1000GB S-ATA3, 600MB/Sek.
Wireless LAN: Asus PCE-N10 150 Mbit
Operating System:Windows 10 Home 64-Bit
Keyboard & Mouse:Cooler Master CM Storm Devastator II
Display:AOC E2270SWDN (22")

Has anyone any "advanced" ideas why my system might freeze? I am out of ideas here and I am a frikkin tech myself.
The freeze can happen at any moment not only under load, but also with no load at all.
The system can run for days without any issue and then suddenly freeze after 30 min of operation.

What I have tried already:
Burn-in test for both RAM and CPU for over 24h -> nothing
Ran memtest86+ for several hours -> everything OK
Reinstalled Windows -> no help
Connected through power stabilizer -> no help

#bangsheadagainstwall#
I see no reason why this would happen. The system shows no issues at all and then suddenly does not react anymore. Only shows frozen screen. Does not react to any input except reset button.

Any help appreciated

[LancelotTheLion]

The only other reason I can think of is an issue with the GPU. But it's fairly new, so perhaps the PCIe port? But I'm no tech.

[Asgardvds]

Thanks for the reply. The board has a second PCIe slot. I will try switching the card there. Haven't tried that yet.

[Shadi_P]

I know it is far fetched but have you checked the thermal paste for your processor? It could be overheating and freezing things up on you.

[Asgardvds]

I did a burn in Test for the CPU and it's temperature remained stable even with all 8 cores running at 100%. So I think the cooling is OK.