Sliding gates often fail to open or close because debris blocks the track, wheels slip off the rail

https://tysonjheb045.lucialpiazzale.com/why-your-sliding-gate-won-t-open-or-close-common-causes-to-check-first-3

Sliding gates often fail to open or close because debris blocks the track, wheels slip off the rail, tracks shift out of line, or the operator needs a reset after an obstruction is cleared.