Today I was sitting at my desk with my phone right in front of me and I heard it play the new text message sound and vibrate. I unlocked it, and there was no red bubble over the SMS icon, which means that I didn't get a message. I'm sure it was a text message alert because I didn't get a new e-mail or voicemail either and they play different sounds. But it did alert me that I got a new message. Strange. Has this happened to anyone?