If it closes before that distance has been traveled it thinks something is wrong and it reopens to help prevent any damage or safety risk.
Garage door closes then reopens.
If your garage door won t open or close the problem could be a bent track a broken torsion spring or a bad capacitor int he motor housing.
It goes partway down reverses direction and goes back up again.
If you re craftsman chamberlain etc garage door opener is closing and then opening up its likely a common problem related to the stop limit mechanism.
If it closes only partway the safety sensors are usually responsible clean the lenses or realign them and make sure there are no obstacles blocking the beam.
But changes in weather conditions can causes your garage door components to shift or contract.