I am a PC dealer, and if you preheat a stone, then put something cool on it - you get a broken stone. Even it the dough was warm, it was nowhere near the 450 degrees the stone was heated to. It does have a 3 year warranty, so if it is less than 3 years old, you can get it replaced. If you need a new one, let me know and I'd be happy to help...just PM me!
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