I was REALLY getting sick of this too. I was watching it on my Xbox and it would go from like 240p up to HD, then every time Dynasty was about to play it dropped back down to awful. I was pissed that I couldn't just choose what I wanted.
I guess Xbox frowns upon players who play on as well. (Ollie Lang)
OT: Mine did the same for the first few minutes. Seems like you have solved the problem.