Thanks for the further information. The fact that it only occurs with your MP4 files is a good clue. It could be either a deficiency in your Samsung H-series TV's firmware (i.e. it cannot resume MP4 - h.264/AAC files), or it could be the MP4s that you have are encoded in such a way that your Samsung H-series TV cannot resume playing the file from midway within the MP4 file. We'll email you a new device profile & steps to try.