He declined to defend it because he disagreed with the way FIDE was organizing and managing the tournament. I believe this is around the time they threw him out of a tournament for wearing jeans, when he was not the only competitor present in jeans.
I think it's nearly universally accepted that his streak ended on a technicality rather than a legitimate decline/defeat.
I think it's nearly universally accepted that his streak ended on a technicality rather than a legitimate decline/defeat.