A door built to spec in 1997 was sized for the springs and cable gauge of that year. Almost thirty years on, the cable itself has usually had zero maintenance - no lubrication, no inspection - and it's carrying a door that's had panels replaced or an opener swapped at some point, changing the balance the cable was tensioned for. Add Katy-area heat: F3 marks this a moderate-heat climate band, and repeated summer expansion and contraction on an unlubricated cable accelerates fraying at the drum end, which is exactly where we find most of the failures. This isn't a coastal-storm problem or a freeze-thaw problem - it's a slow-wear problem tied to age and heat cycling, and it shows up as a cable that looks fine until the one day it doesn't.