We experienced the same - our toddler gets an episode of Wonder Pets every day after she comes home from day care. When my wife drove her home that day she got her all excited to watch it, and she was singing the theme song the whole way, only for my wife to get home and select the show (still displayed in our recently viewed list) just to get hit with an error message. Had to research some to find out what had happened. We were actually lucky that we already had a Prime account and found the shows there the next day when we read online what was happening.

Really bad user experience and communication, combined with a very passionate target viewer for those shows who doesn't understand license negotiations.