I think there were older posts about that. You can investigate with Mazda and compare the costs. But if the car is fine when driving, keep in mind that when you stress the power steering with continuous movement like turning the wheel without moving, then try to park, then turning the wheel again without moving, etc, it warms up so badly that it shuts off. This is on the owner's manual. When it cools down, it works again. If you have been doing this kind of parking for the last 6 years, maybe it is time for the part to fail. You should check the suspension for the tyres wear and align the wheels if the suspension is fine.