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The gondola is the little thing that glides along the track. I’m assuming you do not have a screw-drive. The opener bar is attached, one end to the gondola, and the other, to the garage door. It (the gondola) needs to slide smoothly along the track. Then there’s the door wheels. Or do you have a 1-piece pivoting door, typically found in areas where there is no snow?
Did you recently adjust a spring or door track? Maybe someone hit the door or track. There are also a couple of screws on most of the opener units, which allow you to adjust the opening and closing force.
Try pulling the emergency handle to disengage the opener from the door. Then open and close toe door manually and see if it sticks anywhere. You can also try to consult your manual for more troubleshooting tips, if you still have it.
It could also be something internal to the unit, in which case it would probably be cheaper and easier, in the long run, to just go buy a new unit.