hello forum,
i recently switched from openelec to libreelec and i am very satisfied with my media center. but, there is a small but annoying thing i couldn't fix yet. sometimes i have some strange display flickering while playing a movie. it happens mostly at scenes with a lot of motion, but sometimes on slower ones, too. it's hard to describe, as english is not my native language, so i made a video with my phone and extracted a frame with the "flickering".
it looks like this, happens only for a fraction of a second. don't mind the borders, TV is 16:9, movie 21:9 
the video files itself are not the culprit, they are playing on PC just fine. the flicker occurs random, never at the same time if i rewind the scene and only while playing a movie (not in menu). i changed from displayport to hdmi and switched the hdmi cable, but with no luck. maybe it's some sort of driver issue, back at openelec everything was fine - but i want to stay with libreelec
here my setup:
Libreelec on Intel NUC D54250WYKH2 (i5-4250U Haswell), with 2x8 GB RAM and 60 GB m.2 SSD. Movies are played via SMB from a NAS connected via gigabit ethernet, using up to 8GB of RAM as playback cache. the NUC is connected via HDMI to my Samsung J-Series UHD TV, running at 4K@30Hz. Problem occurs at 1920x1080, too.
