In a recent glaze firing at our community studio, something exploded and we wonder whether it might have been one or more of the bisqued "cookies" placed under a couple of pieces in case of possible glaze drips. These cookies have been used in multiple glaze firings - let's say perhaps 4 - 6, not sure. No thrown / glazed pieces blew up (as far as we know), though some were damaged, of course, from the bisque fragments embedded in them. Someone suggested clay fatigue as a possibility, saying that on occasion a ceramic baking dish used for some years can explode in the oven (and wouldn't THAT be a mess!).
Can anyone offer ideas about this? Thanks.