I am having the same problem. I got a new xfinity provided modem. I returned 2 tv boxes and set up 2 Roku + sticks. They worked great for about 2 weeks and then stopped. I have done the same steps, restarted modem, restarted Roku, signed out xfinity beta app, deleted beta app, reinstalled beta app. Still get same error message. I'm able to stream on my iPad, Android phone and computer. Internet works, phone works, and the 1 remaining xfinity dvr tv box I have works fine for live tv as well as streaming and recording. Only the xfinity beta app does not work on any of my new Roku + sticks. All other apps on stick stream fine. Help! Please.
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