Housing in the Danville service area was mostly built between 1938 and 1973, with a median year of 1957, and the stock across the 11 named areas we cover skews pre-1960. Doors and openers get replaced over the decades, but the track brackets, jamb framing, and header clearance were sized for the original hardware. When a homeowner later installs a heavier insulated steel door on that old framing, the spring and track were never re-matched to the new weight, and something gives - usually the spring first, then the opener gears trying to compensate.
The cold moderate climate here adds a second stress. Steel track contracts in hard freezes, and grease that was fine in August turns stiff in January, which is when a marginal roller or a slightly bent track finally binds and jumps the rail. On homes with an unheated garage under living space, that morning cold-start load is the single biggest reason we see broken springs cluster from December through February rather than spread evenly across the year.