I have a 2016 Chevrolet Cruze 1.4. The steering wheel has about 5–6 degrees of free play before the wheels respond. The steering feels loose, especially after driving over speed bumps or rough roads. The steering wheel moves left and right slightly without changing the vehicle's direction. The steering became stiffer after a repair, but the play is still there. The suspension components have been checked, and the ball joints are OK. The steering rack was repaired and a part inside the gearbox was replaced, but the problem still remains. What could be causing this?