The housing stock feeding our Cameron calls tends toward the 1938 vintage, older than the typical build year across the rest of the service area (which runs 1938 to 1960, median 1949). Doors on houses built around then were not designed for today's taller, heavier insulated panels, and plenty of them still carry the original steel rollers on solid steel tracks with no nylon anywhere in the system.
Steel-on-steel rollers in a cold-climate region like this one wear faster than people expect. We're in a severe cold band here, and steel contracts in the cold just enough to tighten tolerances in the track - so a roller that was merely noisy in August can start binding hard in January. That's not a Cameron-specific metal property, but it's a Cameron-specific outcome given how much of the housing out this way is still running original 1938-era hardware that was never upgraded to sealed nylon rollers.