i would have the alignment checked. i would also make it a daily routine to check the steering fluid. Especially to set a basis for how much the system loses. Maybe after that you can trust every other day or so as a date to check it. Always wise to check the fluids, all of them. many people forget to check the oil, coolant level at the overflow, brake fluid, tranny fluid, washer fluid, power steering fluid, and clutch fluid.