Is this Over The Air (OTA)? I've noticed that folk are often mystified by OTA oddities like this.
I have a brand new TV and having issues with sound on 2 channels. I am using standard TV cables and everything else works well. on these channels I can hear the volume at the programmed level for second, after it drops to zero then it pop backs up to the original programmed level. I have a second TV from a different brand and it is working fine during the same time. I believe it is the TV but cant isolate the issue. anyone have any thoughts?