The failure pattern we see tracks straight back to two things: the age of the housing stock and the climate band. With median construction landing around 1970 and most of the area's 24 named communities built out in that same 1960s-70s stretch, a large share of the doors we're called about are original hardware nearing or past sixty years old - springs, drums, and rollers that were never meant to last this long regardless of maintenance. Layer on a cold-severe climate, and steel contracts hard in a Fond du Lac January, which is exactly when a spring that's already fatigued from decades of temperature cycling finally lets go. Across the 21,979 households in the service area, with 14,521 of those owner-occupied, that's a lot of original garages hitting this same age-and-cold combination at roughly the same time, which is why installation calls cluster in the cold months rather than spreading evenly through the year. It's not bad luck - it's an old door meeting a hard freeze.