In my case, it started to bother me more when I found the thread, I know I would keep tapping the button every day and be annoyed by it more and more until eventually, after a very long time, I would stop caring. If you're anything like me, I would recommend you get it back to the store, I switched out mine and it came out perfect. Over time it might get back to the rattle, but it's not the same as it being there out of the box, although I don't think it will happen. It's true you might get a worse one or one with a tint on the screen, but If you're dealing with a reasonable retailer, just keep switching until you get a perfect one. From what I've seen, it seems the ones with loose home buttons are not the most common. It's your money, your phone, you should be able to get a flawless s6. Good luck!