Power moonroof

I own a 2002 Toyota Camry SE. My power moonroof works ok when i open it all the way and close it. But when I incline it, it inclines but it comes down a little but stays open a little and makes a small bang noise. Sometimes it stays all the way up and when i try to bring it down, it makes bang noise then it comes all the way down. Has anyone had this problem? Any help would be great thanks.