Most of the houses across this service area went up between 1962 and 2005, with the median build year landing around 1983. That matters for springs. A torsion spring is rated for a cycle count, not a calendar date, but the two track together - a door that's opened and closed twice a day since the early 80s has put a lot of wear on hardware that was never meant to be serviced twice a decade.
The 34 named areas we work across share the same 1980s-90s stock pattern, so we see the same failure show up on a schedule. Add the cold moderate climate band this region sits in and you get metal that contracts hard on frost mornings, then heats up again by afternoon. That expansion-contraction cycle fatigues steel faster than a spring sitting in a garage that never sees a freeze. It's not one bad winter that breaks a spring. It's twenty of them, on hardware that was installed once and never touched again.
We're not guessing at this - it's the reason spring calls cluster the way they do here instead of spreading evenly across the year.