I have a consistent problem with movies getting to hold and next buffering when playing 4K UHD/HDR/Atmos movies. This is the case with all movies using this combined format. It depends how the HDD is connected for the severeness: - USB2: The movie will stop regularly, time out en next starting filling the buffer again. Interruptions are very long. - USB3: Now mostly only the sounds hicks up regularly. - SATA: plays mostly without interruptions. - NAS? Did not try. Even USB2 is more than fast enough to keep up the video+audio streams so it must be the way buffering is done. With regular BD and 3D-BD never see this. Expect this to happen on other models too but don't have those.