HEadlight Help

I was wondering if anyone else has ever had this problem. I have a 2000 Firebird. My headlights still work AND THE MOTOR WORKS. wHEN i
TURN THE HEADLIGHTS ON THEY POP UP WITH NO PROBLEMS. But, when I lowewr them the motor on the drivers side still runs for a minute when they close. It has not caused any problems yet, do you know how to fix it.
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