Have a set up consisting of a Dish box connected to Pioneer receiver VSK-321) connected to Epson projector by HDMI cables that was working. Suddenly, the audio has stopped. It will come on sometimes and go off all by itself. Any ideas on what could be the problem? This is driving me crazy. I have replaced HDMI cables, but that did not fix the problem. I have tried other sources such as XBox One. Same result. Help.