Thanks! That's just what I wanted to know. I'm not able to send commands to the TV with the USB ethernet adapter I'm using, but I am able to stream from ny NAS. If it works for you, then it's an issue with my adapter so it might be worth a try getting the Cable Matters one.
With regards to the issue you were having, the behavior you describe is the same that happens to me when bandwidth is exceeded. Does the stop occur at times with a lot of information is audio and video? Bitrate is not constant, so some scenes could cause a peak that triggers buffering, while the rest of the movie streams fine?