HBO Max buffering and foreign language isdue

Subscribe to HBOMax thru xfinity. Impossible to watch on TV via X1 box. Constant freezing and buffering, and will switch to different language in the middle of the episode. This is the only streaming application that does this and the only streaming I purchase thru xfinity. This does not happen with any other streaming service. I’m getting ready to cancel, it’s becoming impossible to watch.