Has anyone else had this "problem." On NBC and CBS there is no Audio during many commercials while listening through my receiver. If I turn up the volume on my TV the sound is there. This started happening about a month ago. The sound during the shows is fine with the exception of the very end 30 second portion while the credits are rolling. The quotes around problem is because this is not really a problem and could be considered a blessing. Does anyone have any idea what is going on and why this just started happening?