have had my yahama home theater system hooked up to my dish vip211 for several years with infrared cable no problems. suddenly one day i turn on my tv and my cbs station has no sound...other channels are ok...so i start rebooting and trying different things....now some channels have sound only through center speaker, some channels only through side speakers, and idea what happened to me? i run the setup test on the receiver and all the speakers test out fine which makes be think it is cable? or dish receiver?