A torsion spring is rated for a cycle count, not a calendar date, but most residential doors open and close roughly 1,500 to 2,000 times a year - and a spring installed when a Box Elder house was built in the early 2000s is now well past the point where metal fatigue matters more than how it looks. The spring doesn't fray or visibly wear. It just lets go, usually on a cold morning when the steel is stiffest and least forgiving. That's the pattern we see out here more than a sudden failure from abuse: original hardware, original spring, first real cold snap, done.
The cold itself matters too. Winters here sit in the severe end of the cold band, and stiff steel cable and dry rollers are a bad combination with a spring that's already near its limit. It's not that Box Elder doors are built worse - they're built to the same code as anywhere in the area - it's that enough of them are now the same age, reaching the same point in the same kind of winter.