every 1080 file I have tried from Amazon going back many versions when direct played to Plex gets part of the way through (70% often) and then starts slowing down. setup is a plex server played over wired gigabit to an Apple TV 4K (not the one that just came out this week). No problems direct playing UHD rips at 8x the bitrate on that setup. the Netflix and Disney files are fine. I've been passing anything that comes out of anystream's amazon provider through a clean up script to re-mux with mkvmerge as a workaround. But during the outage I was using a different tool and found the absence of that step to be beneficial. I've seen assorted patch notes about "improved muxing". Is this still an area of active work?