Mine is doing it as well. The video is laggy or jumpy if you will and the sound is not synced. I assume it's from the migration and will be ironed out eventually.
Had the same problem. Fixed by going to SYSTEM>SETTINGS>VIDEO>ACCELERATION and deleting" allow hardware acceleration". On one box deleted all three on another box only deleted 2, top and bottom ones. This worked for me. Hope this helps.
FYI - Issue was limited to HD channels. SD channels were fine.
Following tonster's tip, turning off the first two radio buttons under acceleration worked for me. Works fine for me if I leave the one labeled mediacodec enabled.
I'm on Kodi 17, built in stalker client , Gbox 2. 60Mb down. Video acceleration tip didn't work on my end . made changes to Playback in PVR & Live Tv. Timeout when starting playback from 10 sec to 20 sec. Fallback frame rate set to 50 Hz.
Before on all defaults only some channels played now a lot more play.