switching out the Xfinity-supplied cable tonight for a high speed one.
I would like to know how this works out for you. Usually with HDMI cables, they work or not. Many of those high-speed cables that cost a mint are not really better than quality cables that are reasonabley priced. Monster cables for instance cost a fortune, but test show they are no better than cables that cost a quarter as much. I've tried several different cables, with the same result of having to reboot the 4K box to get it to work. But if a new cable works for you, that is great, and maybe I'll revisit that.
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