I noticed that my AC 2qt saute pan is not sitting evenly on a flat surface - there is quite a bit of wobble. It is even worse on my burner b/c the coils aren't flat...in fact, the front of the pan sits about 1/4 inch above the stove surface when on one of the coils. I hardly used that pan - is warping a problem typically caused by use or is it a manufacturing defect? Also, is there anything I can do to fix it? I got the pan at Williams-Sonoma, I believe (several years ago), but never noticed or examined the alignment. Anyway, as I am investing in some good cookware, I want to ensure that my other pans don't end up like this!