This does not happen with major network shows, so don't think it is a cable issue (no issues with two shows watched on ABC and CBS and two series watched on FOX). It happened with several episodes on both HD and regular Ghost Adventures on Travel Channel (I have to watch regular episodes as I am occasionally unable to access HD episodes I have been watching after an extended pause or an attempt to rewind... when I try to restart it says program unavailable for access...very irritating. Will not let me have access to the show even after a day passes...but this is another issue that occurs on all channels). The program will either be mute or break up and go black. I sometimes have to stop and restart several times to regain show with sound. It is apperantly still running as time passes on the show if left running blank.
I am out of town right now, so can not test other shows, but will upon my return next Wednesday. Still appreciating the trouble shooting...