2014 TOYOTA SCION Steering Problems

I HAVE A 2014, SCION XD, I WAS DRIVING HOME IN THE RAIN GOING ABOUT 60-65 ON THE INTERSTATE. WHEN MY CAR LOST POWER. MY RADIO WENT OUT, A/C OFF. LIGHTS OFF, WIPERS STOPPED RIGHT IN FRONT OF MY FACE BLOCKING MY VIEW AND MY STEERING WHEEL LOCKED. ALL MY DASHBOARD LIGHTS CAME ON. NOT SURE HOW LONG POWER WAS OUT BUT IT DID COME BACK ON. LUCKILY THIS TIME IT DID NOT CAUSE AN ACCIDENT I WAS ABLE TO GET OFF THE INTERSTATE SAFELY WHEN THE POWER CAME BACK. I LET THE CAR SIT AND RESTARTED. THE CHECK ENGINE LIGHT, AIRBAG LIGHT AND TRAC OFF WERE STILL ON. BIG SAFETY CONCERN. HAD TO HAVE THE CAR TOWED TO THE DEALERSHIP WHERE THEY TOLD ME THE COMPUTER DID NOT PICK UP ANYTHING. IT WAS JUST A GLITCH MEANING A PROBLEM THEY COULD NOT FIGURE OUT. WHAT DO WE DO ABOUT...