Juli 2016 HELP! Pled on OSX IMac to Xbox 360 Suddenly Audio out Of sync

Plex have been an awesome mediaplayer since the X-Box 360 app was released, and it have been flawless for half a year, running with resolution-settings 720 / 4 Mbps. Now suddenly, out of the blue, the audio is totaly out of sync. Try to watch a movie with 7 seconds lipsync-delay, makes every movie-fan cryin’. As I sad It’s now totally useless. It all started when I turned on the subs in the X-box 360 menu. Great! It worked out just fine. I don’t know if this is the source to the problem, but this is the only changes I’ve made. The movie cotinued with the subs (happy me) without problems, but now I can’t play any of my files that worked out just fine before. Audio is way out of sync. Not even the movie where the subs was turned on works anymore. Of course I tried to change back the settings from the same menu, but now the X-box menu just display that there’s no subs, and there is nothing to choose. Trying to change the resolution iand so on, but nothing’s seems to solve the problem from this Heaven of ■■■■.

It would be highly appreciated if someone on planet Earth have the knowledge about this and could give me some feedback how to solve the problem.

Regards / Olsson