Gas dryer has been noisy and motor hums when turning start switch. After drying a few loads it would not start at all until it was left off for a while. Now it will not start at all and motor hums when turning switch. I also had noticed that when I had left the timer in the on position and the door was closed, I heard the motor hum and try to start before going off again. Is there more than one issue involved here? Thank you