2006 Hyundai Sonata steering problems

Dt: the contact owns a 2006 hyundai sonata. The contact states that the vehicle over steers very badly. He states that if one barely turns the steering wheel it will lunge into that direction. Has to constantly correct the steering of the vehicle in the direction consumer wants it to go. The vehicle was taken to the dealership twice, and they told him that nothing was wrong with the vehicle.

On two occasions, while driving in the rain, the battery light turns on, the steering wheel locks and the car stalls. Once I stop and turn the car off and back on, it runs as normal. On three other occasions, the battery light will come on for a couple of minutes, steering wheel locks, but car still drives, then the seatbelt light flashes on for may 20 seconds, then all lights go off and the car drives back to normal.