PC Freezes and Pixelates

[AngryPig]

I have an Intel NUC8v7PNH with 32gb RAM and a 512gb SSD which keeps freezing. Audio stops and my keyboard and mouse (through Synergy) stop working. The screen pixelates (attached photos). I have tried stress testing the machine both with Prime 95, Crystal Disk Mark and FurMark without being able to reproduce the issue. It has occurred 4-5 times. Intel has already replaced the NUC (kit not RAM and SSD) and I have updated the chipset, BIOS and reinstalled windows twice with no luck. Any suggestions on what is causing this and how to fix it?

[George.]

You've tried reinstalling Windows and updating the drivers, however, if this issue first appeared after some update some time ago, it's possible that you still have it installed, assuming you've installed a newer version of Win or let it update after installation.

You could try an older version or a different build of Windows, since it's possible that this issue is due to a system-driver-some win update incompatibility. You could also try installing older drivers one by one and see if that fixes it?

I've had a lot of issues caused by a random update of the OS or some driver that were only fixable by reverting the update...

In terms of HW, since you've tried stress testing the major components and you've ruled out overall system instability or overheating issue, it's probably due to a software bug. Guess it doesn't hurt retesting the parts and monitoring the temps? 

[AngryPig]

16 minutes ago, George. said:

You've tried reinstalling Windows and updating the drivers, however, if this issue first appeared after some update some time ago, it's possible that you still have it installed, assuming you've installed a newer version of Win or let it update after installation.

You could try an older version or a different build of Windows, since it's possible that this issue is due to a system-driver-some win update incompatibility. You could also try installing older drivers one by one and see if that fixes it?

I've had a lot of issues caused by a random update of the OS or some driver that were only fixable by reverting the update...

In terms of HW, since you've tried stress testing the major components and you've ruled out overall system instability or overheating issue, it's probably due to a software bug. Guess it doesn't hurt retesting the parts and monitoring the temps? 

It was a fresh install of 2004 both times that I updated to 20H2. I only got the device brand new two months ago so it shouldn't be a legacy driver issue that has carried over. The PC is used 8 hours a day at work in that time and only happened a few times so bit hard to repeat things for checking each driver. Any idea of what more specifically it could be to try avoid testing the wrong things?