Nokia N95 8Gb
Function keys problems

I have a problem with my main funtion keys..they just stopped working all of a sudden..and have mood swings..they work at there own will! i cant seem to reject calls or open any of the applications due to this particular problem. ive tried soft and hard resetting but both havent seem to done me any good!

and when i move the slide to a particular point they keys function but when i open the slide to the full extent they dont work!