Every so often my power steering will feel extremely hard to turn. It mostly happens when it is hot out and I have been driving the car for a while. What happens is I will be going around a corner and holding the wheel still but in a turning position and when I exit the corner and go to straighten the wheel it is extremely hard to turn but if I turn into the corner more then immediately the other way (basically like f1 drivers do to warm up their tires) it will break free and the wheel will turn with a normal amount of force once again. I had a leaky PS res so I replaced it with a new one from IPD along with the main hose from the res to the pump. I also had the pump replaced a few years ago with a rebuilt one from FCP. When I replaced the res the problem stopped happening so often but is still there. So my question is what do you guys think? Bad rack? Just too much p/s fluid? Or a failing pump? Thanks in advance for your help.