Check the vent where it exits the house. Go outside and look inside the vent cover. Lift the flap where the vent exits the house. I just learned last night that there is another filter tucked away inside the flap. Mine was plugged solid with lint. Today our dryer is working great. Need to check the filter twice a year. I have added it to my daylight saving task. Change the time and the batteries in the smoke alarms and clean the outside driver vent filter.