So I have a shiny new Panasonic 58DX700 and thought I'd try playing some 4K MKV samples on it, lacking any other 4K content to try it with right now. What I am finding is that it plays the first few seconds smoothly then freeze frames while playing the audio, the picture then updates now and then. This seems to happen as soon as there is a large change to the on screen image and never recovers. Am I missing a setting or something, because I would expect the hardware decoder in the TV to handle this just fine. The video stream is H.265 and the audio is DTS-5.1 (or so the file info says). I have tried this on USB stick, over fast wifi and even with an Ethernet cable direct from a NAS storage device, so I dont think its I/O related. Would love to hear from anyone who has this working or knows something about why it is perhaps doing this.