Jetta 1.4 TSI Sport - Gear Problem
 

My Jetta have been IN & OUT the Volkswagen Service Center to solve the Gear problem (when Gear ON on move, it jerk for a few second and also the low gear could not shift to another gear for a moment). The Volkswagen Service Center alway said the problem have been solved whenever I collect the vehicle. But the problem come back again after a few days of driving.
Please can someone help me.