Wisconsin winters are the backdrop for almost everything we see on these doors, and Chippewa Falls sits in the same severe cold climate band as the rest of the region. Cold doesn't create a fault out of nothing, but it exposes whatever was already marginal - a spring near the end of its cycle count, a cable with a few frayed strands, weatherstripping that's gone stiff and let the bottom seal crack.
On a door dating to roughly 1970, the springs are long past any reasonable service life even if nobody's touched them, and steel that's been through fifty-plus winters of expansion and contraction is more brittle than it looks. Cold mornings are when a weakened spring finally lets go, because the steel is stiffer and the force needed to lift the door is higher right when the opener tries hardest.
The other driver is simpler: a lot of these houses have had one opener swap and zero spring swaps. Nobody thinks about the spring until it snaps, and in a town built mostly in one era, that means a lot of doors are due at roughly the same time.