I too experience video stuttering playback issues on a RPi2 with Kodi 18.x on LE 9.x with 1080i MPEG2 North American Over-The-Air TV content. The cause of the video stuttering appears to be a change in the default automatic deinterlacer to Adv(2x) in Kodi 18.x used in LE 9.0.2. On LE 8.2.5 with Kodi 17.6 the default automatic deinterlacer is Bob(2x). To work-around the issue you can manually select the deinterlacer from the in-playback kodi menu.
For now I have chosen to stay with LE 8.2.5 on my RPi2, as described in a tutorial I wrote: Installing LibreELEC 8.2.5 with MythTV PVR Client on a Raspberry Pi 2/3/3B+
'Hope that helps.