If so, this in not unusual for an audio feed to be disrupted/volume levels varying with certain channels @ certain times/during certain types of feeds (e.g. DD5.1 vs matrixed surround, etc.). As much as I complain about Comcast (for example), I still eventually find something else to complain about
Have you considered swapping out your cable or sat box just to see what happens?
Been having audio problem for some 5 years. tried two different tv's and 2 stereos, but still happens time to time..currently using Pansonic viera plasma, bose ascoustimate 5 speakers with sub woofer all going into a pioneer elite 5.1 stereo receiver... This problem only happen with the TV. not the apple tv or PS-3..or VCR.... Here's the issue....the sound cuts out from time to time...raising the volume with the remote will temp correct it....the crazy part is.....if i'm watching some thing with a sound track (music) the talking part cuts out while the music continues to play but at a somewhat lower volume... No i'm old and half deaf, but even i know this is not normal..any help would be appreciated..