My 722K recently started having some issues. The picture freezes, but the sound continues (sometimes) for a few seconds. Then everything freezes, and the remote won't do anything. After a few minutes, the receiver will reboot, but sometimes it will not finish the boot up process before it reboots again. I have unplugged every cable from the receiver, unplugged the receiver, and reconnected everything. Sometimes it will work for a few hours, sometimes for a few minutes. I suspect it is either an overheating issue or a hard drive issue. I have had the receiver for a long time (I actually got it the day after the 722k was officially released) and have never had a problem. Any suggestions?