Update, Shamino and the team from Asus were able to replicate the problem. In short, it was caused by out of spec displayport cables. Pin 20 was used, but should not have been connected. It was leaking voltage into the video cards.
Thanks Shamino, Raja, and Mason for helping to resolve this issue! It is so rare nowadays to get this type of attention and support from a large corporation.
Great team Asus!