mp3 download using file reference class

my mp3 download using file reference class sometimes works and sometimes doesn’t. sometimes it will download a track and not another and then the next time it wont download the one it just downloaded. i have been testing all day and have no idea what to do next. any help would be greatly appreciated.

http://www.4culture.org/publicart/listen/listen4culture2.fla

http://www.4culture.org/publicart/listen/listen4culture2.html