2012 LEXUS LS460 Steering Problems

THE 1ST INCIDENT OCCURRED IN NOVATO, CA MAKING A RIGHT TURN FROM THE IGNACIO BLVD BRIDGE OVER 101N TO NAVE DR. AFTER A RAIN THE PREVIOUS DAY. WHEN THE FRONT OF THE CAR SLID SLIGHTLY, THE SKID CONTROL TURNED THE WHEELS SHARPLY TO THE LEFT FORCING THE CAR INTO THE LANE TO MY LEFT. FORTUNATELY, THERE WAS NO CAR IN THAT LANE OR THERE WOULD HAVE BEEN AN ACCIDENT. I WAS ABLE TO REGAIN CONTROL BUT LEXUS REFUSES TO INVESTIGATE THIS ISSUE INSISTING IT MUST BE REPRODUCED BY A DEALER FOR THEM TO ACT. THIS IS IMPOSSIBLE AS NO DEALER HAS FACILITIES TO DO THIS. THE 2ND INCIDENT OCCURRED ON A HILL AT THE INTERSECTION OF WILLARD & PARNASSUS IN SAN FRANCISCO ON 3/14/14. I HAD MADE A U-TURN TO ENTER A PARKING SPACE ON WILLARD AND WAS FACING DOWNHILL. WHEN I PUT THE CAR IN REVERSE IT RAPIDLY ROLLED...