Most houses in Temecula went up between 1975 and 2009, with the median build year sitting around 1984. That matters because torsion springs are rated for cycles, not years, and a door installed in the mid-80s has been through tens of thousands of open-close cycles by now regardless of how well it was maintained. The same 1980s-90s stock shows up across the wider area too, from Rainbow and French Valley in close, out to Fallbrook, Wildomar, and the rest of the twenty communities we see the same pattern in.
Because the climate band here is mild temperate, we don't get the freeze-thaw cracking or extreme heat warping that kills doors in harsher regions. What we get instead is straightforward fatigue: springs that finally let go after three decades of daily use, galvanized cable strands that fray from repeated flexing, and nylon rollers that have simply worn round on one side. Openers from that same building era are hitting the point where the circuit board and the motor windings are original parts nobody made spares for after a certain year. It's less about weather damage and more about a door doing exactly what it was built to do, for a long time, until a part finally quits.