Steering wheel "locks" under certain conditions and must be jerked to have the steering work properly. jerking steering wheel causes car to swerve causing dangerous situation. conditions: (1) car has been sitting in warm sun for hours, (2) car is then driven on smooth highway at speeds over 60mph, (3) the steering wheel lock occurs randomly on different highway areas (not same part of hwy), (4) has not occurred at low speeds or in small areas like parking lots or neighborhoods. car: rwd, gs350 luxury package, no lane keeping assist on the vehicle tested: had tires checked, rebalanced and rotated and steering wheel lock still occurs.