LG Incite CT810

The "Unlock" soft button at the "centre" of my LG CT 810 phone screen that comes as a prompt after the unlock button at the "bottom" of the screen is tapped is not working. As a result, though the unlock button at the bottom of the screen is ok, the phonescreen is still locked. I am receiving calls so that the rules out that the phone has got locked. Before the problem occured I observed that the screen was behaving funny - the sensitive part seemed to have moved a bit away from the actual area on the screen-that is-suppose if I was to tap the middle of the screen, I would rather have to tap a little away, say about a centimeter, from the middle of the screen.