During normal driving in rainy conditions, I experienced a sudden and unexpected loss of vehicle control involving steering behavior. At the time of the incident, the lane-keeping/driver-assist system was active, and I had both hands on the steering wheel while actively controlling the vehicle. Without any prior warning lights, dashboard messages, or alerts, the vehicle suddenly began to behave abnormally and unexpectedly pulled/dragged. I experienced a sudden loss of effective steering control and was unable to fully correct or regain control of the vehicle before a collision occurred. The incident happened abruptly without any gradual warning or system notification. Road conditions were wet due to rain, but there was no prior indication of mechanical or electronic malfunction before the event. Following the crash, the vehicle was declared a total loss by insurance. There are no open recalls listed for my VIN at this time. I am reporting this incident due to the sudden steering/control behavior and potential safety concern.