Most houses in the Encinitas service area went up between 1970 and 2003, with the median landing around 1983. That means a huge share of the garage doors out here are original equipment - thin steel sections, single-layer panels, hardware sized for openers that weighed twice what today's units do. These doors were fine for their era. They were not built to run for forty-plus years.
Encinitas sits in a mild temperate band, so you don't get the freeze-thaw cycling or the 100-degree summer warping that kills doors in harsher climates. That's actually part of the problem: nothing forces an early replacement, so owners run these doors well past their design life on nothing but momentum. In Cardiff, two miles down the coast, and Leucadia just north, the same tract-era doors from the same building wave are failing on roughly the same timeline, because they were installed in roughly the same years by the same production builders.
With 10,803 owner-occupied houses across the service area, that's a lot of original hardware quietly wearing out at once, not from weather damage but from four decades of daily cycles on parts never meant to last that long.