audio in media files randomly repeats briefly

view story

http://askubuntu.com – Sometimes when I play media files (music, films) the audio repeats itself for 1-2 seconds and then continues as if nothing had happned. When I go back to the position right before it happened, it plays normally. This didn't happen on Fedora, so it has something to do with the different audio software in these two distributions (I'm on Ubuntu 12.04 and used Fedora 17 previously). It's not the media player either. I'm not sure what more information I can provide but I'll be happy to add the output of any commands you might think of. (HowTos)