I have OSMC installed on Raspberry Pi 3. And this problem occurs only with Netflix, not with YouTube. The video lags the audio by 4 to 5 seconds, it stops to buffer about once in 2-3 minutes. Usually buffering takes a few seconds, sometimes considerably longer. Often the video will jump forward after buffering.
The error log is https://paste.osmc.tv/kiqetiqosu
Its so pervasive that Netflix has become unwatchable. I first tried to clear the cache in Netflix settings. That fixes things only for a few seconds. Things go back to normal (bad) after that.
Initially I noticed that I was also getting errors while doing software updates. That was diagnosed as “gmc-18 has been deprecated for approaching a year since 18 became the stable build. Simply remove that line from your /etc/apt/sources.list”. I did the needful and was able to update kodi ad add-on’s successfully.
The buffering problem continues. Please help me fix that.