What Is Going On
A door goes off track when the rollers stop riding square inside the vertical track, usually because something pushed the track out of alignment - a bent bracket, a loose lag bolt, or a roller that's worn enough to wobble instead of roll. In a lot of the houses around Menomonee Falls, built mostly in that 1960s-70s stretch with the broader range running 1938 to 2000, the track hardware is original or close to it. Steel brackets lag-bolted into framing that's had fifty-plus years to shift a little will eventually let the track drift out of true, even a fraction of an inch. That's enough for a roller to climb the lip instead of staying inside it. Once one roller jumps, the door racks sideways and the opener either stalls or forces it, which bends the track further. It's progressive - a door that's slightly off track today is a door stuck sideways next week if nobody adjusts the brackets back to plumb.
What the Weather Here Does to It
This is a cold-climate service area, and that matters more to a track than people expect. Steel track contracts in deep cold, and on a door that's already got a slightly loose bracket, that contraction is enough to let the track flex outward on the cold mornings and settle back when it warms. Do that enough winters in a row and the lag bolts work themselves looser in the framing - you can often see the wood around the bolt holes compressed or splitting slightly if the track's been loose a while. On an older house with original hardware, that's exactly the failure path: not a sudden impact, just repeated cold-flex loosening fasteners that were driven into framing decades ago and never torqued again.
