That seems to be one of those tough to find glitches.
Possibly a vid driver issue, try a few different sets. Be sure to go into "control panel">"device manager" and uninstall your card. Then run Driver Sweeper and remove the "nvidia display" drivers.
After it restarts it may install a driver from the system32 folder, just let it. Then install a different driver. Nvidia Drivers
Another thing to try is to run MemTest as when running prime small fft's its not putting alot of stress on the Ram..
I use OCCT Stress Test it will stress all cores, and it has a 2hr cpu test that if it passes will be as stable as you can hope for. As well as having a voltage and heat sensor so you can see what voltage is actually being put to the cpu and what temps it maxes out at.
If memory, cpu and vid card are stable, then Id say try reinstalling windows, or uninstalling motherboard drivers and installing the most current ones.