IPhone 4 home button going crazy?

Quite randomly the home button has started going mad. It doesn't always respond to the touch but will automatically press it's self without touch lighting the screen (as if you have touched it), and activates the voice control (as if it's being held down), all this can happen when it's just sitting alone on a table & does it at random times.

It's not a new iPhone, I bought it when the 4 was released. Does anybody know if it's a software problem & any way to correct it? Or is it simply a physical problem with the button which needs replacing?

Any advice would be appreciated.

Ya the same is happening with my iPad 2, I try pushing the home button, but 99% of the time it doesn't respond but in the very rare case when it does respond, even if I click it once, it acts as if I double or triple clicked it. I believe it has just stopped working due to physical problems even though the iPad never fell nor cracked and is in perfect condition. That's Apple for ya!

It is probably very old (In electronic years) and its a simple wear and tear process.

Free & Easy Fix

Go to Settings App → Accessibility → Assistive Touch

Cheap fix:

Go to a nearby Apple store and ask for a fix, or pay them to replace your home button