That happens to me on a regular basis. I just take it as a limitation of that particular bike. I can only lean so far unless I time the turn -very- carefully. The nice thing is that unless you're really pushing the limit of traction, your rear wheel usuall sticks again and you can just keep riding, (although a bit shaken). The trick is as soon as it happens to put some weight on the front wheel and make sure it stays on your turn line, otherwise you can go way off track.

If it does kick your rear wheel all the way out, it's not even that bad of a crash, 'cause your foot's in the pedal, so it's likely just road rash, and probably nothing bashed or twisted.