I have a Samsung TV and am having similar problems. Xfinity is trying to help, but so far they have not solved the problem. For us, we can turn on the TV, load Xfinity, but the remote buttons don't then work. The remote will work for all other apps.
Xfinity tech did some things at the Xfinity end and told us to uninstall and reinstall the app. We did, No different. What solves the problem TEMPORARILY is "power cycling the TV" as they put it. Pull the plug. When it restarts, the remote works fine. But some time later, after we have turned off the TV and then turn the TV back on, same problem. Can't change channels, etc. Very annoying. We are getting into the habit of pulling the plug before we sit down to watch. Crazy!
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