Random stops when playing 4K videos after DSM upgrading to 6.1.5-15254
recently I've updated Synology DSM to the latest version 6.1.5-15254 released on 2018/01/26 and now I experience random stops for about 4-5 seconds when streaming 4K movies (e.g. data bitrate 61980kbps) via PLEX. It seems that the issue I'm facing with might be related to updating DSM, since I was able to watch all 4K videos without any problems before the update. I've tried to reinstall PLEX on Synology NAS, reinstall PLEX app on my TV Sony XE9005, nothing is helping. Synology NAS is not overloaded: CPU usage is less than 3%, RAM about 25% when playing 4K videos. PLEX version is 22.214.171.12402, Synology NAS is DS716+, no changes has been made on the home network side.
Any clue how can I solve this issue? Does anybody facing with the same issue after installing the latest Synology DSM? Maybe the issue I'm facing with and DSM updating might be coincidence?