By crash do you mean that the games simply freeze?
If so mine happens to do this sometimes, and is rather frustrating as i am unable to save!
Consequently i just remove the mem stick and my Superkey, blow in the catridge slot and insert again.
Pre-ordering from realhotstuff.com, which is the best shipping method for international orders? (I am in Australia). There are so many options i'm not quite sure which one is reliable