I have a 3yr old Progress Hybrid that it appears has a warped bypass door. I started to notice, this year, that I wasn't able to fully turn the bypass handle on the stove. When I opened it to clean the cat I noticed that there was a sizable gap with the bypass closed. When I removed the door it is noticeably warped. Has anyone else experienced this on the Progress Hybrid? I've never had any real problems with stove temperatures. It usually runs between 400 and 500 degrees (stovetop temp). I do need a new gasket as well but I'm surprised that the cast iron would warp in such a short time.