I have just setup on a Windows emby server, migrating from using a qnap server. I never had a single issue playing a 4K movie on the qnap. Now the movie will pause every 10 secs. Seems to be a bandwidth issue. Everything is connected via gigabit ethernet. I can transfer a file from the qnap to the pc with emby running at 112mb sec.  My media location is e.g. \\192.168.0.160\Multimedia\Movies Shared network folder \\QNAP-TS653a\Multimedia\Movies   Any suggestions why