End Button not working

[galaxyrunner]

Hi,

My end button on my Telus branded P4000 [WM6] seems to have stopped working, when ending a call, I need to hit the End button on the touch screen as even multiple pushes on the physical end button result in no actions. Have I manage to inadvertently set this button to "do nothing"? I've searched through all of the settings and can't seem to find a way to "turn this button back on".

Thanks,
GR