Constant buffering

Unable to watch programs on my tv using Chromecast due to constant buffering. My internet is very fast and I have no trouble streaming Netflix on Chromecast, but not HBO. Every 1 or 2 min of show is followed by 1 or 2 min of buffering. Perhaps look at how Netflix is doing it and follow suit. Please fix.

Paym01 about HBO GO: Stream with TV Package, v13.0.0