Power Steering Light On problems of the 2015 Infiniti Q50

Cars steering wheel will clunk and turn opposite directions will reversing into parking spots or slowly taking off from being stationary. This has happened a few times over the course of 4 months and I've only had the car for about 7. Last night I was pulling into my driveway and the steering wheel sharply turned right, I shifted the car to park, and the car just completely died. Nothing had worked at that point, no lights, ignition, keys, nothing. I got out of the car and shut the driver door and everything turned back on except now the steering wheel won't turn unless using unreasonable force. Power steering light illuminated, chassis control. This has also happened on my test drive with the vehicle in December of 2018 with 54,000 miles before purchasing . The steering wheel slightly twitched and I expressed my concern to the dealer and he said it was normal. It was very lightly that you could hardly tell it did it so I wasn't suspicious of the car having problems. This has not almost caused in accidents but I have a 3 month old girl and this is very unsafe and also my only car.