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I just exchanged /upgraded my Motorola RNG TV box with a Pace and Samsung XG2 TV box. (Comcast Cable boxes shown here: https://www.xfinity.com/support/cable-tv/x1-hub-vs-companion-box/). I now have the exact same problem. My Sony str-dn 1080 worked with the Motorola box per Sony's setup guide. I have no solution yet.