iPhone 4 Home Button not working properly

Hi all,

My iPhone home button (round button at the bottom) has started "not responding correctly." Sometimes when I press the button it works as it should, but other times it takes at least 10 clicks before anything happens. I can hear the clicking sound that the button physically makes so I can't imagine that it's hardware related - but it sometimes doesn't want to do anything.

After searching Google and the forums it seems to be pointing towards a software issue? I upgraded the phone to the latest software 4.3 around 3 weeks ago.

Modern Firmware - 01.10.01

Any advice is much appreciated,

mrdanang