Two things stack against older doors here. First, the age itself - hardware from around 1990 is well past its rated cycle life on springs and rollers, even with no obvious damage yet. Second, this area sits in a severe heat climate band, and sustained high heat breaks down lubricant on tracks and rollers faster, dries out cable lubrication, and accelerates metal fatigue on springs that are already near the end of their working life. A newer door in the same heat has more life left to burn through before it shows a symptom. A thirty-year-old door doesn't have that cushion. That combination - old hardware plus consistent heat load - is why the same fault that's a minor annoyance on a newer install can turn into a stuck-open or stuck-shut door here with less warning. It's not that Sun City West's doors are built worse. They were built to a normal standard for 1990. They've just been out here longer, under conditions that use up spring life faster than a garage door in a cooler climate would.