Every once in a while, when I'm using the Pre with Bluetooth (I believe it has happened without it) and the phone's PIN lock is activated, I am unable to unlock it - I slide the lock icon up, and the blue background for the unlock pad appears, WITH NO NUMBERS! The ONLY way to get it back is to end the phone call and wait for a few seconds, or to reboot the phone.

Obviously, extremely frustrating if your phone locked and you need to say, DO ANYTHING on your phone, even just enter a number for a prompt. Anyone else seen this problem?