Why do your sentences never make sense? Do you ever read your own posts?
Anyways:
Do you mean part of your AES case has snapped off?
Old style case or snap lock?
If you mean the plastic case of an old style case, then this does crack very easily, and the plastic flaps of the lid also tend to rip.
If you mean the snap lock tab which holds the case shut, yes this does tend to snap off if you are heavy handed.