4K H265 stutter in Kodi 17 but not in Kodi 16

Have tried playing som 4K H265 HDR files in Kodi 16 and they work fine in my Sony XD9305 with Marshmallow. Tried same files in Kodi 17 and even 17.1 RC and they stutter regularly. The same files are played perfectly in the built-in video app. Someone that can explain that?