Dryer shutting down two to five min. into cycle E- 1

Removed the front lower skirt with two 1/4"hex screws. Vaccumed all inner parts exposed. Removed three 1/4" screws holding the blower housing.Memoved the bias thermister again two 1/4" screws. Make sure all inner exaust pipes and rear chimney gas or electric are clean and lint free. Re assemble and test the unit. Install the skirt and make sure the dryer is level Jack, Pa.