Random CRITICAL_PROCESS_DIED Crash

[webhead]

Hey All, I built my first PC about 6 months ago with the help of this great community, everything works great except for an occasional 'Critical Process Died' crash. There seems to be no rhyme or reason for when it crashes, for example it will sometimes crash just sitting idle, other times when gaming or rendering graphics. Sometimes it will crash 4-5 times a day, other times it can go a full day or so without a crash, And I've tried everything I can think of over the last few months to no avail... Here's a list of the things I've tried:

 

New Operating System, (Crashes on both Windows 8.1 and Windows 10.)

Different Graphics Card, same Issue on both the GTX 970 and 980Ti.

New Ram.

Different Hard drive.

 

Here are my Specs:

 

Motherboard: Asus Z9pe-d8 ws

CPU: 2x E5-2670

GPU: 980Ti

Ram: Samsung DDR3 64gb 1600Mhz ECC

Operating System: Windows 10 Pro

 

Let me know if any more specs would be helpful, and if you know of any other tests etc to try?

Thanks for any help!

Steve

[webhead]

It seems to me that the only possible issues could be with either one of the CPU's or the Motherboard.. as everything else has been swapped out, and the same issue occurs. Any tests I could do to check these? I've already done some, but because it happens so random tests always come up okay.