I have a pretty fast connection on my Wi-Fi at home and have the best tier available so I know my Internet connection is not the issue when it comes to this. Add that YouTube works fine on the MBP. So I am in the YouTube app, and say I watch a video. The video would play very smoothly, until it hits a certain point where it just completely stops. From here it looks like the app just "give up loading" and I pretty much have to exit out and go back in the video, and then try to find the spot where it left off.