Having a similar problem, which started late yesterday afternoon 02/15. Several weeks ago, I started streaming into a secondary TV with Roku Premium; everything was fine. Before the problem started, all channels available on Roku were same as on my primary TV with an X1 TV Box. Last evening, many favorite channels previously available on Roku were prompting me to "Subscribe", not "Watch", and that I needed to upgrade my plan. Balderdash. Sadly, I wasted much time removing, then reinstalling, the Xfinity Streaming channel on Roku. Likewise, I power cycled, and also online restarted, my Xfinify gateway several times. Problem persisted. Today, I chated with rep who wanted me to repeat everthing I had already done. My problem does not seem to be HD related. It is more like channels available on Roku are those of a more basic TV channel plan. Not the 130+ channels in my Xfinity TV package.
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