Frame skips due to rising “vsyncoff-value”

Hi,

My System:
– intel i7 6700K
– ASUS Strix GTX 1060
– 2×8 GB RAM
– Windows 7 x64
– KODI 17.1 Krypton
Screens:
– Samsung SyncMaster 2243EW
– LG 55EG910V

Problem:
Frame skips during playback on my OLED TV, especialy when I connect it to the hdmi port of my graphics card. Executing “playerdebug” (per default Ctrl+Shift+o) I can see the value for “vsyncoff” rising. When it reaches about 42, wich happens every 3 minutes, it will reset to zero again and cause a frame skip.
Connecting it to the hdmi port of my mainboard and using the igpu of my cpu, that value decreases slower and will reach -42 every 25 minutes causing a frame skip.
In comparison I installed LibreElec on an USB stick and ran my test files with 25, 24 and 23.976 fps (1080p/h264 mkv) with my TV connected to the mainboard. 24 and 25 fps files would remain at a constant value in a span of about 0.4 causing no frame skip at all. With the 23.976 fps file that value increases very slowly so it would have taken hours before a frame skip would happen.
I tried all that also on my desktop screen, which is connected via DVI to my graphics card, and the vsyncoff value always remaind constantly at zero causing no frame skips.

So is this value an indicator that my TV can’t properly handle video over hdmi? But why is the LibreElec OS then so much better running? If it were a driver issue, why does my Samsung desktop screen show no frame skips at all?
Can someone enlighten me?