The first thing i would check would be the exhaust vent,make sure it is clear and not restricted,Do you use more then one fabfric softener sheet at a time if so they tend to stick to the exhaust port inside the dryer. Next would be how our the clothes coming out of the washer our they wet? Make sure you are not using the air cycle on the timer.The last thing I would check, because the dryer is less then a year old would be thermostats and heater.