If the issue presents from only one channel, the issue is the channel broadcast.No, I haven't gone though Audyssey setup yet, so DV isn't engaged (good thought). When I went to look last night, Audyssey was grayed out on my setup menu because I had performed manual speaker level setup.
When I watch a show on cable (Spectrum) and the show goes to a commercial break the volume remains the same, but when the channel returns to main programming, the volume level is often crushed down to barely audible - even though the value is say 50. If I turn up the volume from there, it does increase a little. The signal is Dolby Digital.
If I simply change the channel, the signal I guess re-sync's and the volume level is restored. if I then go back to my original channel, sound is also fine/loud as expected.
I've looked all over to try to find a screen in the menus where I could troubleshoot. Is there a diagnostic mode? Any other troubleshooting to try?
If the issue presents with multiple channels, try connecting the HDMI cable to other HDMI inputs.
If still no joy, refer to post 4 and do the various resets.