I'm running Air Video Server 2.2.2 on El Capitan 10.11.2 and Air Video TV on my Apple TV 4. I started using Apple TV 4 at the end of October, as soon as it came out. For a month I had no issues at all, everything was great. About 10 days ago every airplayed video starts without sound - I have to use various tricks to have it work. Sometimes restarting the Air Video server is enough, but lately it is not working either. I must use at least few steps to make sound comes back - (1) I have to restart Air Video server, then (2) start air playing the video and (3) fast forward it few minutes, then (4) fast rewind back to start and only then audio starts, although always few seconds after video starts.
At the same time playing Netflix, playing music or video from computer iTunes works without any issues on Apple TV 4, thus it is definitely the Air Video Server of Air Video TV app problem. A help will be appreciated.