Every day since Sunday, my 522 has overheated. It suddenly stops showing what I'm watching and displays a warning message that contains the current temperature of the unit. Once I power cycle the unit, it seems to be fine again. Has anyone had this problem and had to replace the unit? I ask the question that way because nothing in my 522's environment has changed. It is in a stereo cabinet, but it has been there since it was installed. Last night, out of sheer frustration, I put my 522 on 4 wooden blocks about 2" thick to provide more air underneath the unit. I hope that alleviates the problem, but I'm not too optimistic.