I registered an account just to reply to this thread. 
I am using 3990x with 256GB G.Skill Trident Z RGB 3600MHz.
When I try to run stability test, my system too froze up, what happens is that after a couple of minutes, it defroze itself, leading me to wonder if it has issue allocating test scenarios to consume the huge 256GB of RAM. Reason being that, after it defroze, the memory test can run for hours with no issue.
Just a thought.