Hey all. I have owned this iPhone 3GS for just under 12 months now. Yesterday afternoon I plugged it into my girlfriends music dock and it shut off. Upon restarting it was telling me to plug into iTunes, like it does when you get the phone brand new. The only problem is it shuts down automatically at random intervals, but never more than 15 minutes on. This makes in nigh on impossible to restore but after countless attempts I got it to restore, and upgraded, to IOS 5. It worked with IOS 5 for about three hours, and now its doing something similar, however now I can unlock the phone and it then tells me to plug into itunes. (the first round only gave me the option for an emergency call). However the same problem with the random shutting down occurs, and sometimes itunes can't find the device, and it doesn't show up with 'Eric's iPhone' on the side bar... What can I do?