My cousin knock the phone on his hand hard for few times and problem went away.

must be fierce     
my home button occasionally had some problems, sometimes it vibrates few times when i press. i brought to gardens SC and they say they'll try reprogramming the firmware, but after an hour they give me back the phone they actually changed the whole screen and also the battery without informing me. they say because the home button is together with the screen, ok la. then the home button worked after that. but when i reach home i tried to adjust the home button sensitivity then i realize the sensitivity adjustment doesn't work, not only that, the earpiece was rattling too. so brought back the next day and demanded for 1 to 1 exchange. they say cannot, SC only can service, cannot do exchange. so ask her to ask manager come out, scolded the manager then he said ok can exchange but must wait 2 weeks. i can't wait 2 weeks so i persisted i wanted an exchange that day itself. then he say 1 week, i persisted same day. then he made some calls and he confirmed i can get a new unit on the next day. this new unit works perfectly fine, very satisfied.