I am having the same problem. H eavy pixelation on just the network channels such as ABC, CBS, NBC, and FOX. It is not occuring on cable channels such as FOX News and CNN. I tighten up all the connections. I've had the service for one month and since the first day I am having this problem. I already restarted my equipment from the xfinity website and did not work. Please help me.
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