I have a le Creuset quiche pan I got over twenty years ago. It's not ceramic, but enameled cast iron just like their dutch ovens. I noticed recently that it doesn't sit quite flat on the counter--it rocks a bit. I don't think it was always like this.
It's not a big deal, the pan is still perfectly usable. But I am wondering how it happened, and if there's any way to flatten it again. I'm guessing there's not, short of installing a blacksmith's forge.
I use it in the oven, of course, and I think I might have actually used it on the stovetop a time or two, figuring that apart from the shape it's really no different than any other le creuset.