Outwitters file size grew to 3 gigs on iphone, why?

[darwindog]

Ive been playing Outwitters for a few months and noticed it chugging really bad recently, then it started crashing CONSTANTLY when i would load a match, i checked the file size under 'usage' and it was nearly 3 GIGS!!! I re-installed it and its back to normal, although after a few games the file size increased by 830k, anyone know why this happens and how to cure this problem without re-installing it? Thanks!