Lose Power Steering problems of the 2005 Toyota Matrix

While driving the car stalls. Mainly the issue appears to happen when turning. Suddenly, and only occasionally, the car dies while turning. All lights are lost and power steering gives out. Since the lights on the car and the power steering give out, it is a scary issue. We have to put the car in neutral (since we're driving) and restart the engine. Back in 2010 we brought our car in for the 2010 recall where they replaced the part, although we never had a stalling issue then. Our car is still at the dealership being looked at but we were told by Toyota corporate that this isn't an issue related to the 2010 stalling recall, so it would not be covered even if the same part that was replaced during the recall is the one that needs to be replaced again. Additionally, the dealership is having trouble identifying the cause of the issue.