If it has dampness sensor strips inside the machine they may be coated with dryer sheet wax or some other mess. Clean them with windex and retry. As the clothes rub against these sensors the dampness causes the dryness board to keep the machine a going. if no dampness is detected the dryer shuts down. Supposely to save power. If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61