I have a Motorola DCT 6200 hi def box connected to an Onkyo TX-SR702 receiver. When I use a remote or manually press channel up/down on the cable box, I keep losing the feed video1 and the tv screen goes dark. Its instead changing something on the receiver that displays "dialogue" and various +2/-2 +4 etc. It also turns the blue light near where it says "true audio" on and off. If I keep clicking in one direction several times it ultimately gets back to working settings and the video (cable broadcast) shows up again.
Any ideas at all what might be causing this and how to correct it? Or even what component is the issue? I'm not too experienced and i've spent many hours on this.. i need my life back! The connections are fine - optical cable and Y-Pr-Pb.