Two things are stacking on top of each other across this service area right now. First, the housing stock: with a median build year of 2002 and most of the stock going up between 1979 and 2005, a huge share of doors, springs, and openers are aging out in the same narrow window. This isn't a slow trickle of failures spread over decades - it's a wave, because the houses went up in a wave.
Second, the climate is doing extra work on top of that age. A severe heat rating means the steel door panels expand and contract more than they would somewhere milder, which loosens hinge screws and throws panels slightly out of true over the years. It also means the grease packed into a torsion spring at the factory cooks out faster, so a spring rated for a certain number of cycles in a mild climate reaches the end of its life sooner here.
Put those two together - a 20-plus-year-old spring, on a door that's already flexed a little from heat cycling - and you get the exact failure pattern we see most: a spring that snaps without warning rather than one that gives a slow, gradual signal first.