Sony Android TV 2015 bad performance

Hi Smile

After I upgradet to Krypton 17.1 videos are played very badly. It is like it plays a bit very fast, then buffers for a second and then plays a bit more very fast.

I had no problems in older versions of Kodi.

My videofiles are either ISO-files or DVD structure (ifo, vob etc.)

If I compile the video ie to a mkv-file there is no problems.

What can be wrong? I assume it might be some settings for video, how do you reccomend I set up the Kodi?