I have had my HOX since it came out and have not had any of the reported problems until this weekend. I had trouble connecting my wifi to a router at a family members house and had to power on/off to fix it and then was fine until today when the phone reset itself and then did an immediate and very quick power drain...this was also solved by a restart. I'm charging now and all seems fine but obviously concerned. I've had this phone for about 1 month now and not sure I can return it back to ATT (It was preordered and mailed to me).
Any advice?
I experienced the very quick power drain issue, as well, several times. Haven't found a solution, as I've tried the hard reset, battery cycling, etc. I just try to recognize when it happens and reboot. Granted, it's rare... but sucks not being able to rely on your phone to hold battery while it's asleep.
In terms of taking the device back - try calling AT&T. The store where I pre-ordered added another 30 days to my grace period, because there is zero stock in the stores, so I can't exchange it (was going to try swapping the unit to solve the battery issue). So you may, at least, be able to exchange it.