This is reported by various users with content devices that outputting Dolby Atmos MAT format: Microsoft Xbox One Discussion Page Xbox One X does not support HDR content via Plex DirectPlay. Constant buffering is plaguing Xbox Plex player for the last 2 years, and was never totally fixed it, but it should work a lot better with webOS Plex app.
Pi-hole users may encounter issues signing in, creating, or recovering accounts upon downloading the 1804.
