Yam RXV-667 and Dish Sat trouble (1 Viewer)

I recently had Dish satellite installed. I connected the sat receivers HDMI cable to the HDMI1 input of my Yamaha. RXV-667. HDMI output of the Yamaha then goes to my TV. Sat signal makes it through to the TV but is intermittent, like a contact somewhere is randomly making and breaking somewhere. It looks fine between blips, just won't stay continuous.I move the input cable from the satellite box to another signal source (DVD player) and signal is fine. I connect the satellite box direct to the TV bypassing the Yamaha and again, signal is fine. I remove all inputs and bring up the Yamahas programming screen and it too looks fine on the TV. Best I can tell all this verifys the Yamahas inputs and output.In short all other video/ audio sources play well with the yamaha, except for the satellite box. Its only useable when connected direct to the tv. For some reason the yamaha just "doesn't like" the signal from the satellite box. And I don't have a clue as to why. Could it be overloading, or somehow out of synch? Any help?