Arizona's summer heat is severe, and it doesn't treat every door the same. On a house built around 1990, the torsion spring has had three decades of expansion and contraction in triple-digit heat, and the factory lubricant on the coils has long since baked off. That's the spring that snaps without warning, usually on the hottest stretch of the year when the door gets used the most.
The openers from that era show the same pattern from a different angle. Chain-drive units built in 1990 weren't engineered for the duty cycle a modern household puts on a garage door, and the gears inside the drive housing wear down faster in sustained heat. We see the symptom as a door that opens slow, grinds, or reverses partway.
Cables and rollers age the same way - heat dries out plastic rollers and makes steel cables brittle at the fray points. None of this is unique to one house; it's what happens to hardware from 1990 that's spent every summer since baking in an Arizona garage.