I have had this issue as long as I can remember through all images.
if watching a recording I turn the box off (using my harmony remote which turns off tv, box and soundbar altogether) WITHOUT stopping the recording when I turn the box back on I have NO SOUND at all to any channels.
The only way to resolve this is to turn the box OFF again and then back ON again and then I get sound.
Any ideas people
As mentioned this has been present for as long as I can remember over different images
TIA Bart