Mazda Repair Questions? Ask Mechanics for Answers ASAP
It sounds like you have a failing power steering pump or power steering rack. If you don't plan to perform diagnosis or repairs yourself I would suggest having a shop check the fluid pressures from the power steering pump. If the fluid pressures check out ok then the power steering rack is likely the problem. The way the rack on this vehicle typically wears out is with one side bypassing fluid to the other and causing it to only have power steering while turning one way and not the other.
Please let me know if you need any additional information.