I have had my DirecTv for a few years now with no problems. I have a DVR w/ two cables in the living room and 3 regular receivers w/ single wires in bedrooms. Lately, when I'm watching something in the living room and someone turns on the same channel in one of the bedrooms both tv's go to "Searching for Signal" and stay that way until one of the receivers is changed to a new channel. Anyone ever heard of this happening? Might it be the multi-switch going bad in the attic? Any help would be greatly appreciated.