I'm having the exact same problem with my ax760i. I originally thought it was the surge protector I had the power supply plugged into. Unfortunately, the other day the random shutdowns came back (after I had removed the surge protector). Out of nowhere and without warning... ... *click*... the computer just shuts off. Sometimes I'm able to power the computer back on and sometimes I'm forced to unplug it before it will boot back up.
I'm glad corsair's customer service is easy to deal with. They're sending me a replacement so hopefully it's just a bad batch and not common to all the units.
