What can cause this symptom
Several garage door failures can produce the same symptom. Springs, cables, tracks, rollers, opener components, safety sensors, or physical obstructions can all affect how the door moves.
Safe first checks
Make sure the doorway is clear, check whether the opener has power, and look for obvious track obstructions or visible damage. Do not loosen spring hardware, cable drums, or other tensioned components.
When the symptom needs a repair call
If the door is crooked, unusually heavy, jammed, hanging from a cable, off track, or making a new severe noise, stop operating it and call for professional help.
Safety note: Garage doors are heavy and spring systems can be under high tension. Do not loosen spring hardware or cables if you are unsure what failed.