@raffy What you are seeing seems to be slow network speed – the TV is buffering before it can continue to play. The suggestions I made before are not relevant.
First thing to check is to see if you have a strong enough wifi signal for the TV: log in the router and click Status, check the value in the Signal column. Should not be less than -80dBm.
If wifi signal strength is good, you might want to try switching wifi to a different channel (in Settings/Wireless).
You might also want to try comparing Netflix playback on a PC vs. on the TV.