Hi. I'm Steve. I'm sorry to hear about your TV. I will try my best to give you a precise and accurate answer.
It could be a number of things but the most likely cause is a sub-par internet connection.
Can you run a test at www.speedtest.net and let me know the results.
Can you download the Netflix app to your PC and see if a movie on the PC behaves in the same way.
The problem is the wireless signal in your home. A few things you can try:
Change the wireless channel to 1, 6 or 11 - you will need to log into your router to do this.
Temporarily unplug any cordless phones in your home - they may affect your wireless signal.
Let me know if that improves the situation.