I got my 4S for christmas and I originally had a fairly mushy home button. Over time it's developed a small click sound when pressed, louder when pressed in the middle. Does anyone elses 4S make a click sound when the home button is pressed? This is especially noticeable when double pressing it quickly for multi-tasking. It's perfectly responsive and I know I'm very nit-picky, but I'm just wondering if this is normal. Thanks!