Fond du Lac County sits in a cold climate band on the severe end, and that shows up in the track hardware over decades, not in any single storm. Repeated freeze-thaw cycles work bolts loose in jambs, and grit and salt spray thrown up off a driveway in winter gets into roller bearings that were never sealed to begin with - a common trait on doors from Oakfield's 1960 building era.
On a door that age, a roller that's been dry and gritty for a few winters eventually seizes or wears down enough that it jumps the track under normal use, especially on the bottom section where the door takes the most flex opening and closing. It's rarely one dramatic event. It's usually years of small wear finally giving out on a cold morning.