Xbox One Playback

So recent update to PLEX on either the Xbox or PC has now caused troubles with playback of videos at times where there is audio only and no picture and only restarting either the PLEX server or the Xbox fixes it temporarily until maybe the next thing I want to watch then the cycle begins again. This occurs with .mkv’s and avi’s etc… Literally got no info other than that but it was working and now it does this and it sucks!