2012 LEXUS CT HYBRID Steering Problems

1) A LIGHT IN A DASHBOARD CAME ON SAYING "CHECK HYBRID SYSTEM", I TOOK IT TO THE LEXUS DEALER , THEY CHANGED THE NON HYBRID BATTERY), CHARGED ME $350 FOR IT AND RESET THE COMPUTER. 2) A WEEK AFTER, THE LIGHT STARTED APPEARING AGAIN WITH THE SAME MESSAGE, THE MESSAGE APPEARED IN THE MORNING, IN THE WAY BACK HOME, COMING OUT OF THE SPEEDWAY , ALL THE LIGHTS IN THE DASHBOARD CAME OFF (BRAKES, ENGINE, ALL OF THEM) AND I LOST COMPLETE CONTROL OF THE CAR: NO BRAKES, NO STEERING, NO NOTHING. I TRIED RESTARTING THE CAR AGAIN, IT DID, AND THE NEXT DAY WAS DRIVEN TO THE DEALER AGAIN. THEY TOOK IT IN, HAD IT OVER 2 DAYS, SAID THAT THEY FOUND A "LOOSE CAP IN THE HYBRID BATTERY", RESET THE COMPUTER ONE MORE TIME AND GAVE THE CAR BACK TO ME. 3) THE CAR DID NOT FEEL THE...