The "official" resolution does everything but tell us to put rabbit ears back on our TV. I have a 4k UHD tv. I pay for an Xi6 (and an Xi4) to go wireless. The picture freezes and the surround sound channels cut in and out. It is NOT my surround system so don't blame them. My speeds, at times, are 1Mb/sec download! Xfinity's data speeds may be to blame for the problem.
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