something to do w/ur suspension prolly, maybe balljoints(even though i can justify why)
take it to an inspection shop and ask them to do an inspection(part of the inspection is testing ur balljoints and tie rods)
or, if you wanna do it urself, lift up the car, take the wheel and push up on it, like a bump, and if there is any play, ur balljoints are bad, then take the wheel and twist it(liek ur steering the car) except very slightly(have someone hold the steering wheel if you dont know how to do it) and if there is any play, tis ur tie rods.. do this for both front wheels