I ordered my iphone and just got it today. I had to go through all this hassle of going through 4 at&t stores just to activate it. when i finally got home i realized that it shuts off every 5 minutes. i already did a factory restore and it still does it. i set up a genius appointment at the local apple store at the promenade. do you think i would be able to get an exchange even though they said they were out of stock? do they have an extra stock for defective iphone exchanges?