I just noticed that the back of my iphone (where the silver meets the black) on one of the sides has a little give to it. If i gently squeeze the phone it makes a little noise and has some give. It's not visibly noticeable but its bothersome when I hold it and feel a little give. I didn't drop it at all..... I wonder what Apple's exchange policy is? Is it something that would need to be sent out?