Sliding gates often fail to open or close because debris blocks the track, wheels slip off the rail
https://westus1.blob.core.windows.net/home-fix-hub/sliding-gate-motor-and-operator-repair-in-la.html
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.