The car just turned off and didn't make any noise. I didn't even notice until I started pushing on the gas pedal. The Power steering, power brakes, everything went completely off, which can be super scary to happen on a freeway. Thankfully I had enough speed to get over to the side. I put car into park and restarted and it worked again. I think it might be a sensor or plugs. Z Car is always extremely busy and very far and can take weeks and often don't get a satisfactory resolution to the problem. They drive it for a week and tell me things are fine. I think I want someone who can simply replace all of the plugs and sensors, since they seem to have an issue often. I'd rather pay more and just have peace of mind.