The emergency alert makes the app unusable. Once it pops up it will do it's thing then go to a black screen and never return to the channel you were watching. The only way to get out of the black screen is to press the "home" button on the roku remote. After returning to the home screen, then going back into the xfinity app, then going to any channel...wait a few seconds....then the emergency alert starts again and then hangs once again at a black screen.
UNUSABLE, which is unfortunate, as up until this point it was pretty good aside from some user interface issues that need to be addressed.
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