Just within the last month the steering has been sticking when trying to maintain a straight line. When trying to stay straight there is resistance in the steering and suddenly the resistance stops, causing driver to over correct. Also if the car hits a bump or road irregularity while the steering is resisting movement, then the car wanders even further in lane. This repeats itself constantly and car is wandering back and forth in the lane. The lower ball joints have been replaced and condition continues.