I have similar issues with NFL GamePass app. On the GN2, I have to my bluetooth device off (but can have blue tooth radio on) when I start a video, otherwise the video plays like it's on fast-forward or only shows a black screen. On Android 4.1.2 the video would stop, and I would have go from full screen to non-full screen for the video to start playing again.
I have the same issue with NFL GP app on my tablet (ASUS Infinity Pad (TF700)) as well. So it's the app. I have no idea because it's only thing that does it; no issue on Netflix, Hulu, Crackle, MLBatBat, ESPN3, NHL CenterIce, BBC iPlayer, Google Music to name a few.
It just happens.