Oven issue

I have a weird issue with my oven. Whenever it reaches the target thermostat number (400 degrees or whatever) , it makes a loud boom sound. Not terribly loud....but not quiet either. Its usually at the moment when the gas turns off. (when the thermostat reaches the desired amount) This sound only happens the first time the over reaches the thermostat amount....all other instances of it going above and below the thermostat number , it doesnt make that sound. Only the initial time. The oven uses propane by the way.
Any ideas ?
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wrote:

Used to be called 'oil canning', after the flexible bottomed oil cans that allowed one to pump oil from the spout. Your oven has a panel that expands in the center beyond what the edge does. When the resulting stress is relieved, the noise occurs. Probably not harmful, might even quit doing it after some time.
Joe
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Thanks Joe. Yeah i've noticed sometimes its barely audible. While other times its pretty loud. I never knew about this Oil stuff. oil cans ? From what im able to translate it seems like its just metal constricting from the heat.
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