I updated to iOS 9 earlier this week, seemingly with no problems. Until I woke up this morning. On my lock screen I could see a message that I received during the night. I opened Messages to read the whole message and send a response, and there is nothing there. There's a time/date stamp from when the message came in, but nothing. I rebooted the phone, still nothing. Any idea what happened here or how I can get it back - and how I can prevent it from happening again? Thanks!