Have recently got a 4k TV but can't play 4k from Plex server without buffering. I have put file onto ssd to eliminate my USB drive as an issue. Running server on pc, have tried connecting to shield via gigabit switch and still getting buffering issue. It says it's direct playing so not a transcoding issue. What is the best way to test bandwidth between shield and server. The performance under task manager shows it fluctuation lot when attempting to play content.