Netflix Has Problems
Either Netflix has issues with my 50/10 Comcast connection, or Comcast is doing something to the Netflix streams. I've verified that my Netflix account is allowing the best quality streams on Netflix.
Trying to watch Avengers on Netflix and I could not keep an HD stream with my Roku. I immediately switched over to my Amazon Prime channel on the Roku and I was able to watch the same move in HD with no issues.