Home Button Clicking Problem

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http://forum.xda-developers.com – Hi guys.. I bought my phone 1.5 months ago,white S4 i9500. In the last week,when I touched home button's left side slighly,it's clicking! In the beginning,this "clicks" are very slight. But nowadays,I can hear that from a distance. Right side is normal,button functions. Only left side. As well as,my brother's phone's home button is on the level of screen,not protuberant or high,completely inside. But my phone's button is slightly higher. Not on the level of screen. When I touched it up and down as if it's moving. I didn't drop it. No hit. I love my phone.. Do you think,is it a i (HowTos)