Here is my setup
hdmi1 - sat dish
hdmi2 - dvd
hdmi3 - roku
Here is the problem. Roku is working fine. Then if I switch the TV to hdmi1 for a couple minutes, then back to hdmi3 (roku) I get the "unsupported audio format..." error.
Elsewhere on this forum it was suggested to reverse the hdmi cable. No difference for me..
Turning the TV off, then back on, does resolve the problem--at least temporarily until I switch inputs again.