I have 3 Rokus, 2 are sticks. I have the same problem with Xfinity Stream. This problem is recent and random and occurs on all devices. The video freezes and the audio is fine. Reloading the channel fixes it for a few seconds and then the video freezes again. Pulling power from the Roku fixes it until it randomly occurs again. While the video is frozen on Xfinity, switching to other apps such as Pluto, Prime, etc., are fine. Switching back to Xfinity gives me the same video problem. This is definitely an Xfinity issue.