This area sits in a mild climate band that still sees occasional freeze, and that combination is harder on garage door hardware than either steady cold or steady mild weather alone. Steel springs and cables that are mostly fine in a stable climate get repeated small cycles of condensation and light frost here, which slowly works into any surface rust already started by the coastal-influenced humidity. It's not dramatic damage - it's cumulative, and it shows up as a spring that finally lets go on an otherwise ordinary morning.
The housing age compounds it. With most homes in this area dating to 1964-2003 and a median build year of 1978, a large share of the original hardware is well past any reasonable service life, torsion or extension. Owners in the newer built pockets closer to 2000 tend to call about opener logic and sensor issues; owners in the older 1960s-70s sections call more about springs, cables, and worn jamb hardware. Both patterns trace straight back to when the house went up, not to how it's been used.