Every time i yo yo with my atmosphere, the loop that goes around the bearing becomes too big and the string slips off the yo yo. It still works, but the string falls off alot. 
ROFL LOL LMFAO 
XD
learn to fix your string tension. there are many tutorials you can find on youtube.
EDIT: Here is a good video from Andre that I found on Youtube: http://www.youtube.com/watch?v=3uX7cGKAszM&feature=PlayList&p=D0488DBD90796DDB&playnext=1&playnext_from=PL&index=12
brianhu007, What kind of string are you using?
Your string is probalbly to loose.