When this happened to us, the motor was totally gone. However, sometimes this can occur when the seal inside of the dryer is not fitting right. When the dryer runs to long like this, it puts a lot of strain on the motor, which can in turn ruin your motor, in which case you will have to get a whole new dryer. Don't wait long to fix it. Call a repair place so they can come in and asses it asap before further damage is done.