This is something that seems to have started fairly recently for movies I record off of TV then play on my SHIELD TV.  At certain, repeatable (but unique) points in the video, the screen freezes and you hear the audio continue.  You can FF one click and the video recovers.  Converting to MP4 may or may not fix it.  Playing the video with VLC on Windows shows no problem. Is this just aberrations in the OTA recording?  It happens a few times per movie and seems to be every movie, but it did n