MDPS failing when driving randomly. Steering locks up and vehicle is uncontrollable, while the vehicle is moving. This has occurred at varying speeds, while turning and while driving straight. Dealer has unsuccessfully got the issue to replicate, but independent service center was able to replicate it and found the extended warranty and recommended dealership visit since issue is covered. Vehicle has been inspected by dealership and the first recommended battery replacement, but this did not remedy the issue. EPS warning light is illuminated while issue is occurring but due to safety, car needs to be restarted to gain control of the vehicle and light turns off.