The other night I turned on the dryer and it made a weird noise. Then the noise stopped and it worked as usual. Next day I checked and clothes had not dried Had a small amount of lint in vent outside. Cleaned that out and retried. Dried it somewhat but still had to run another cycle to completely dry it. Now it's taking 2 cycles to dry completely. What could be the cause of this? Dryer is a little over3 years old.