Housing across this service area runs from 1938 through 2009, with most of the stock dating to the 1960s and '70s. Doors and track hardware installed during that build-out are decades past their design life, and steel track from that era wasn't built to the tolerances that current doors expect - it flexes more, and once it's bent slightly it drifts a door off its rollers faster than newer aluminum track does.
The cold climate band this area sits in adds to it. Steel track contracts in winter cold, which tightens roller clearance and makes an already-worn roller more likely to bind and jump the rail during a cold snap. That's why off-track calls cluster in the coldest weeks of the year rather than spreading evenly across the calendar.
We cover this service across Schaumburg and the nearby towns in this area - Roselle, Hanover Park, Streamwood, Itasca, Bloomingdale, and the others within about a ten-mile radius - and the same housing-age and climate pattern holds through most of it, since the building boom that put up this stock ran through the same years across the region.