I have found I can stream happily 1080p videos, then between 10 and 11pm (sometimes as early as 8, but less often) I have to switch down to 720p, then down to 480, then 360, then stop viewing as the night goes on. While at first I thought this was because of everyone starting to dl at 10pm etc, I have done multiple speed tests when its not working and they all give me full bandwidth, and other sites are fine.