Get thicker pans if you're experiencing warping. I had loads of problem with inexpensive but thin tri-ply aluminum/stainless cookware. I switched to big thick

Get thicker pans if you're experiencing warping. I had loads of problem with inexpensive but thin tri-ply aluminum/stainless cookware. I switched to big thick cast iron and carbon steel, and 8mm thick aluminum disc base nonstick/stainless and have never had a warping problem since.