My cubes have been running okay.

The five of them were running well, then one of the cubes started doing the reset problem.

In addition to that, one of my cubes that has been running flawlessly just up and randomly died today.

Everything was 00000000000000s but today I came home to all XXXXXXXXXXXXXXXXXX.

I unplugged it, reseated everything, and had 0000000000000000s again.

However after being plugged in and hashing for about 2 minutes, it just went right back to XXXXXXXXXXXXX.

I'm running http://www.amazon.com/Corsair-Professional-Series-Modular-HX850/dp/B0090I9W66/ for two cubes. It hasn't been a problem at all and that seems like a pretty high quality PSU.

When the cube turns on, it clicks correctly, the two green lights are on, and the red light is on as well.

What is my problem?