Sometimes when I restart my AT&T iPhone 4, instead of going from the Apple logo to the unlock screen (after a bit), I noticed that my phone displays a progress bar. And when this happens, it's as if the phone gets set to factory settings for some things. My data is still there but things like my brightness get reset to a dimmer setting (the default I think) and the percentage next to my battery life turns itself off. Plus I would get a message about the home screen icons which reminds me of the first time I ever used an iPhone. So it's acting like it's a brand new phone even though all my data is there. Is this just a bug or is something wrong with my phone? It doesn't happen everytime I restart, but it's happened enough times now that I've finally made the connection. What do I do?