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I am experiencing the same issue. Particularly on sports channels. It has gradually gotten worse over the last few months. Two techs have visited my house and confirmed that signal issues are not the cause. They've also replaced the box. My TV is a new Samsung KS8000. No issues on smart TV content. Only with video coming from the box.
Mine seems to be getting worse. There are no suggestions? It’s terrible on sports. So choppy at times. LG OLED. Blurays and built in tv apps play flawlessly.
See this link for audio issues: http://forums.xfinity.com/t5/XfinityTV-and-Equipment/Pixelation-video-and-audio-dropouts-One-Moment-...
I wish I could give you more details, but we gave in and had Comcast come out to the house. We discovered we had a signal amplifier (installed by Comcast) in our basement, so they did some testing around that and ended up installing something new to replace that -- along with some upgraded wiring, apparently.
Resolved the stuttering.
Now, unfortunately, we suffer problem that I'm only able to notice on weekend days, and it seems to occur only sporadically, where our internet connection is just shat. Can't load web pages, etc. etc. No outages, no explanations.
Wish we had options.