The pit is the usual culprit. If the drain has blocked, water and sand collect around the post and slow it down. On a hydraulic unit, a worn seal or low fluid causes the same problem. A dry or dirty guide can also make the movement stiff.
Clearing the drain and cleaning the pit often restores normal movement, but a hydraulic fault or a failed drive needs a technician. Qasar Al Neil Automatic Doors can test the unit, clear the pit and repair the drive or seals.
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