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Title: Cookie sheet begins to warp after minimal use
Review: I am sad to say that I am very disappointed with this item. So far I have only used the cookie pan, but I've used it about two dozen times over the course of about 2 months (mostly to make baked bacon, which is awesome by the way). It was great because it was so easy to clean, I was really happy with it. Now it's suddenly warping when exposed to heat in the oven, even at low temperatures (250-300 degrees). Opposite corners of the sheet start to curl towards each other, rendering it unusable.I'm not going to return the product yet because it's possible the other items won't behave this way, and I'm looking forward to making muffins. But I'm really disappointed in the cookie sheet.
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