I have an iPhone 6 and it's been flawless, but I recently noticed that my sleep/wake button jiggle back and forth more than the volume button. I'm worried that I may have loosened up from putting it in and out of the Apple leather case since the case rubs and smashes that button. I don't remember feeling it when I first unboxed it (except to make sure it clicked), but I went to an Apple store and the display units had really stiff buttons. I'm not saying it feels like it's about to fall off, but it definitely wiggles more than the volume buttons. Does yours? I only ask because I'm funny about a new device.