Two things stack up against rollers in this area. First, the age of the housing: with most construction landing between 1959 and 1988 and a median build year around 1971 across the four main residential areas we work, a lot of doors are still running on hardware that's 30, 40, even 50 years past its design life. Steel rollers that old have usually outlived their lubrication and their tolerance for cold more than once over.
Second is the climate itself. This is a cold-climate region with real winter severity, and steel contracts in the cold - tracks tighten slightly, old grease stiffens or dries out entirely, and a roller that was already worn starts binding instead of rolling. That's why roller failures cluster in the colder months here more than in summer: the hardware was already marginal, and the cold is what finally makes it bind instead of just squeak.
Houses with longer, two-car tracks see it worse than single doors, simply because there's more roller travel and more opportunities for one bad wheel to throw off the whole run.