I would make sure the exhaust vent hose/tube is clear of any and all lint buildup, sand, socks, etc from the rear of the dryer all the way to the exhaust port exiting the house to outside... Another symptom is worn drum seals allowing reduced airflow across the heating element making it run hotter altho this would be an unusual problem with a dryer that's not very old... Other issues would factor in, amount of time dryer is used, what types of items dried, etc....