The first thing that comes to mind is the power steering pressure switch.
However, there are a few other possiblities.
Let me know the following;
Does the car shake at any speed?
Are the tires good and have they been balanced?
When was the last time the suspension was aligned?
When you turn the car in a slow u-turn, does anything make noise or feel odd?
Does the car do anything at slower speeds that does not feel or sound normal to you?
Have you been in any accidents or had any service done to the car recently?
I think you are probably in need of replacing the pressure switch, but the loss of control is a concern.
Let me know and I will replay ASAP.
Saturday, November 20th, 2010 AT 5:27 PM