I have had for some time a Denon AVR-X1300W which for the most part works satisfactory with one exception. When watching a tv broadcast show and using the surround with a comfortable listening volume setting of say 40 everything is fine until a commercial comes on. I have experienced a 20 db volume increase which almost blows you out of the room. I have contacted Denon and reviewed my setting but still the issue persists. This problem also comes up during a hockey game, the volume is fine from the broadcast studio until they breakaway for an on ice interview where the volume now drops off, increasing the the volume there then makes main broadcast volume much to loud when they switch back to the main broadcast studio. Its driving me crazy. Any ideas out there? Thx.