I cured the oven per the instructions. I have used it since curing about 5 times. Last night I had a good fire going and my oven developed a verticle crack about 18 inches long, 1/8 inch wide. Two of the firebricks cracked along this path. The outside of the dome is fine, has no cracks and is cool to the touch. Should this cause me any concern? Any advice is very much appreciated. Thank you.
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Please help: Crack inside of dome