Why do doors come off their tracks or snap cables?
Most track problems start with a bump or with slow wear. Common causes include:
- A vehicle clipping the door or the track.
- Ice or packed snow at the bottom of the door that jams the roller or catches the corner of a panel.
- Worn rollers that wobble in the channel and eventually jump out.
- Loose track brackets, which let the track drift out of alignment.
- A broken spring that leaves a cable slack and lets it slip off the drum.
Cables are also affected by moisture, road salt and age. Salty slush carried in on tires keeps the bottom of the cable wet, so rust and fraying often start where the cable meets the bottom bracket. Older Minneapolis garages add another factor. A settled slab or leaning wall can pull the tracks out of line over time, and a door that was a good fit decades ago may now rub on one side.

