Alert Text Box - Crash after Auto Lock (Iphone 4)

I have a game that has an Alert box that pops up for “Play Again? YES, NO” If I don’t answer, my iphone will detect no activity and lock after 1 minute. When I subsequently unlock the phone the Alert Box is still there… but when I select either YES or NO the app crashes. Has anyone else seen this?
Thanks! [import]uid: 16901 topic_id: 7412 reply_id: 307412[/import]