Was watching a DVR program last night and it just "froze". No buttons were active, Joeys went out... after about 2 or 3 minutes the Hopper seems to reboot itself, like 2 or 3 times trying to get started... then went through its normal acquiring signal and all is fine. I assume this is what it does in the middle of the night to update, but this was at like 7:00 PM. Could this be over heating? It's very well exposed on a very open shelf.