I took my iPhone 5 to the Apple store because my lock button had stopped working. They have me a replacement phone which seemed to work great, but now I've noticed that the volume buttons on the side are loose and they make a clicking noise when I run my fingers over them. Technically there's nothing wrong with them in the sense that they are working properly (right now), but I'm worried that after 90 days they might stop working as they do feel really flimsy. I know how the buttons on my old phone felt and these are much looser. I'm wondering if there's anything they could do at the Apple store. I suspect they would say they can't give me another replacement because there's actually nothing wrong with my phone.