You have two cubes on the AX1200i that remain running perfectly, correct?
Swap the other two cubes with the ones on the AZ1200i. If the ones on the 1200W PSU stay happy, it's PSU issues. If not, it's cube issues.
Alright, I will do that next trip to the DC. What kind of issues could the cube be having? I'm getting no X's when running only O's. Thanks!!