I finally watched Bourne Ultimatum on my A3 tonight but I am having some sound issues. Well into the movie when they are in Tangier all of a sudden the sound gets all distorted and sounds like my speakers were blown. To fix it I have to rewind a little bit and it gets fixed but it happened 3 times while watching the entire movie. Would this be a bad disc or a problem with my A3? Should I get it exchanged from BB?