I just noticed this yesterday. I have a Marantz 7500 receiver, and when listening to the Xfinity Music Choice channels or the Pandora app on Xfinity, it goes to stereo. But when viewing a recorded show or network TV it goes back to 5.1. The audio setting on the box are all set to 5.1. Only thing I can think of is that not all the channels on Xfinity are broadcast in 5.1. Any other ideas?
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