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Video freezes but audio continues

Does anyone else have issues with the video player built into the website? I am FB Plus member and use my Android phone for workouts. 2-3 times during a workout the video will freeze but the audio will continue to move forward. I've tried HD and lower quality video options. Also, occasionally my display will time out. Apparently my phone doesn't recognize the video as a video and thinks I am looking at a static image.