The last couple times I have been on a high speed "flyway" interstate ramp I'll be driving around the curve and all of a sudden my car starts to drift out of the turn as if I cut the wheel that way...I take my foot off the accelerator and give it minor break and it goes away. I should add that this is moderate speed, not "pushing it". Also, when steering at slow speeds, there has been a lot of knocking coming from up front, not sure if this is related though. This is scarry.