This will be my third time to apple store. Last two times there were scuffs and screen problem. This time there is a rattling sound in my iPhone, looks like some screww is loose inside. The phone is cosmetically perfect and works fine. However, do you think i should go exchange by risking that the new units will have another problem. Do you think i should forgive apple and get away with it or i should go swap it tmr. How many times i can swap though?