Dim screen on my N95-1.

Hey all.

So I got a new Nokia N95-1 (RM-159). I used it for quite some time but then the screen started to go dim. I just left it there for a couple of minutes and after that the screen flickers and go dim. So dim in fact sometimes it goes straight to a black screen. I have to restart the phone every time I wanted a brighter screen. Please, help! What can I do?