I received a text from a friend this morning, and now I've received that same text message 10 times. I've tried restarting the phone (both with removing the battery and without), and I've cleared the messages cache. None of that has helped. It has also blocked any ability I have to get texts (tested this with another person's Android phone). This isn't the first time this has happened, either. It happens once ever month or so, although it rarely goes on this long.