Hi. First, I want to make sure that we know how you have things connected so that we know how the audio is being routed from the Dish receiver:
- Do you have the Dish receiver connected directly to your Yamaha with HDMI?
Yes I do
- Do you have the Dish receiver connected to your TV in any way?
No I dont
- Are you playing audio through the receiver when the TV is on?
Yes
If you are routing audio directly from the Dish receiver to your Yamaha, playing the audio through your receiver, and have the Yamaha connected to your TV for video only - try turning off the "HDMI Control" feature on the Yamaha if it's on (page 102 of your owner's manual) to see if that fixes your issue.