North Texas heat is the other half of the story. Garage interiors here regularly sit far hotter than the outside air during summer, and that heat cycle is hard on anything made of rubber or plastic - nylon rollers, belt-drive opener belts, foam seals. In a house built in 1999, those parts have been through roughly 25 summers of that cycling, which is well past the service life builders expect from economy-grade hardware. The failure pattern we see most in this stretch of houses is a combination: a steel roller that's worn an oval groove into the track, paired with an opener that's starting to strain because the door isn't rolling true anymore. Neither part looks broken until the other one is. That's a local pattern, not a universal one - a neighborhood of newer builds wouldn't show it yet, and a much older neighborhood would already be past it into spring failures.