This happens off & on with my Droid X, sometimes when I send a text message it gets returned to me unsent with a little red x in the message that say undelivered. I would say this happens every dozen or so texts I send. If I reboot the phone it sends the texts fine. This also happened with my first Droid X sometimes. I know it's not a matter of being in a bad coverage area. The three other Android phones in our family never have this problem. Any thoughts on what might cause this? Anyone ever have this problem?