Most garage doors in this service area went up between 1979 and 2007, with the median build year sitting around 2001. That era is builder-grade steel, almost always the same thin-gauge panel with a foam core, installed by the tract-home crews that put up entire subdivisions across the eight main pockets of this stock. It's a fine door for the price, but it was never built for what a severe-heat climate does to it over twenty-plus years. Steel expands and contracts every single day here, and the foam bonded behind it doesn't move at the same rate. That mismatch is what eventually shows up as a bowed panel, a section that won't sit flush in the track, or a bottom panel that's cracked at the seam where the door takes the most flex. It's not a manufacturing defect. It's just what this specific vintage of door does under this specific sun, year after year, on houses that are now old enough for it to catch up with them.