I am watching the movie The Martian Extended Edition UHD 4k Blu Ray with Dolby Atmos sound. HDMI from Xbox One S going to Yamaha RX-A770 receiver which is connected to tv. Many times throughout the movie the sound goes silent for a split second and then becomes out of sync with the video. Rewinding just for an instant then hitting play again restores synchronization of the video and audio. I am confirmed watching the extended cut and suspect that the issue is occurring when the movie switches to or from footage that is not in the theatrical release. With this setup, all other UHD blu rays with dolby atmos sound that I have tried have no problems.