Keynote video WWDC 2015

I am experiencing great difficulty viewing the WWDC2015 Keynote video. After about ten minutes of good reception the video will get stuck while the audio continues as if nothing has happened. The video never continues. I can begin it again from another point, either before or after the point at which it got stuck, but a few minutes later the same thing happens. This doesn't happen with any other videos on the internet, just this one. Any suggestions?