Upgrade from 17 Beta to 17 release Stutters on Nvidia Shield

I have the Nvidia Shield with latest kodi 17. It no longer plays smoothly on large files. 4K UHD and Blu-ray rips in BDMV format. There is stuttering. I even deleted kodi and completely reinstalled. No luck. Tried a few setting tweaks, nothing worked. Plex on the same Nvidia Shield works smoothly. No stutter at all. The later beta Krypton version did not have this problem. I had it in an earlier beta, deleted kodi, reinstalled to slightly later build and was flawless until this upgrade. What is going on?