Xfinity beta on Roku streaming issues on HD channels

Just this past day or 2 every time I try to stream HD specific channels through my Roku with the Xfinity beta , the channels are choppy , like the frames are slow. SD channels are fine. I also can stream HD fine on Netflix , Hulu, and Prime just fine. This seems limited to just the Xfinity beta channel. I had reset my internet connection and the Roku just go make sure it wasn’t an internet connection. Still the frames are choppy and slow again only on HD programming