Maytag gas dryer heat shuts down
My Maytag gas dryer, model DG412 starts normally when cold. After about 20 minutes, the burner shuts down while the drum continues to turn. The burner will not re-light until the dryer has cooled down for a few minutes. The longer it cools before re-lighting, the longer it runs before shutting off again. In other words, if you can get it to re-light after two or three minutes, it will shut off again after only 5 minutes or less. While if you wait until it has cooled for 20 minutes or so, it will burn again for 20 minutes or so before shutting off again. I have checked all your posts. Air flow seems normal.
Any help will be appreciated.