2017 CADILLAC XTS Steering Problems

Numerous problems for a year have been: engine dies while driving, car totally dead with new battery, display partially black randomly or totally black along with radio display black, park assist is turned off. Headlights turn off and on by themselves; The latest is driving up a hill @ 25 mph, the steering wheel jerked hard to the right at 2 different times. Had I not had a solid grip on the wheel, it would have taken down a 500 foot drop and we wouldn't be here today. This last episode is the first time their OBD was able to read anything. It read "no communication to steering, no communication to brakes, radio, dash display" and other no communications. This car is unsafe to drive and should be recalled or taken off the road. It has been to 2 dealerships and so far have not identified anything that gives me...

ON 4 SEPARATE OCCASIONS OVER THE LAST FEW MONTHS THE POWER STEERING HAS QUIT WORKING WHILE DRIVING. HAS HAPPENED WHILE TURNING AND WHILE DRIVING STRAIGHT. HAS HAPPENED WHILE ACCELERATING AND WHILE DRIVING CONSTANT SPEED. AFTER STOPPING, TURNING ENGINE OFF AND THEN RESTARTING THE PROBLEM GOES AWAY. I DO GET A MESSAGE THAT POWER STEERING IS OUT ON THE DASH BUT IT IS VERY EVIDENT WHEN IT GOES OUT. INTERNET SEARCH SAYS THIS IS A PROBLEM ON OTHER MODELS AND RECALL ISSUED. DEALER SAYS NO SUCH RECALL ON MY VEHICLE.