Nokia N70 problem

[craig@rewind]

I have had my Nokia N70 now for nearly 2 years (I think!) and have had no problems with it. However within the last few days the phone randomly selects the Camera option on it's own, leaves it on for a few seconds (obviously showing black as the camera shutter is closed) and then returns to the main screen. It also unlocks the phone as it does this and doesn't relock it.

Any suggestions?

Thanks.