I recently had an issue with my iPhone 4 and the Apple Store very helpfully replaced my phone. Now, with the new phone I've noticed that the Home button is a bit loose -- it wiggles just a bit when I place my thumb over it. This isn't causing any functional issues, but I was just curious whether this is a common thing or if it can cause problems in the future. (I've had an iPhone 3GS and the previous iPhone 4 and neither of those phones' home buttons were loose like this one's.)