1999 Chevy Tracker DOME LIGHT

HI
MY DOME LIGHT DOES NOT WORK, WHEN I DO REPLACE THE FUSE, IT WILL WORK ONLY FOR A FEW MINUTES, I ASSUME IT COULD BE THE PART THAT CLOSES AND OPEN THE LIGHT WHEN I OPEN AND CLOSE THE DOOR, THE DOME LIGHT SWITCH ALSO ONLY WORKS FOR A FEW MINITES, I HAVE TRIED REPLACING THE FUSES NUMEROUS TIMES WITH SAME RESULTS,
iF IT IS THAT PART THAT IS DEFECTIVE, WERE WOULD IT BE LOCATED

tHANKS
RAY