Steering Is Tight problems of the 2013 Toyota Prius

I was driving on the highway at 55~60mph, and suddenly the power steering trouble light indicator came on. I noticed the steering wheel was a bit harder to turn( left or right). I slowed down and took the first exit, reducing speed to 30~35mph. At the stop sign, all indicators light came on and I couldn't turn the steering wheel (left or right). I was able to accelerate out of the stop sign, but then I felt a "thugh" in the engine, and notice I didn't have any braking power for a few second. So I pulled over, I turned the car off, and turned on again, I immediately drove into a parking lot after the stop sign, the car just died; I couldn't brake, no steering, no gas power, nothing. The car was towed to Toyota dealership. This was the 2nd incidence within 3 weeks. The first time this occurred with similar sequence of failure. The car was towed to Toyota dealership and they said the auxillary battery died, and replaced it free of charge ( car was 24,250 miles at that time). This second time, I hope Toyota can find the root cause of this issue. I don't think the new auxillary battery died again. It's only been 3 weeks since Toyota installed the battery. This is a huge safety risk. I'm afraid to drive my car now. I think I will need to sell the car.