Lose Power Steering problems of the 2006 Hyundai Tucson

Day 1:I pulled into a lane leading to a parking lot. On a 90 degree turn, I lost power steering and the engine light came on. The Hyundai still was idling when I lost the power steering. I came to a stop and the power steering started working again. There was some water on the pavement. Day 2: same as day one in same location on the same turn. Day 5: took vehicle to service center and explained the problem. They came back and said they checked the computer for error codes and none were found. The checked the under carriage for loose wires, none were found. They checked the serpentine belt and it was also found in good condition. Problem could not be found. No insurance safe driving sensor was plugged into the com port. There is a sensor on the windshield that is stuck on. No physical connection to the vehicle.