Hydraulic Power Assist Steering System problems of the 2004 Chevrolet Trailblazer

While slowing for a stoplight the vehicle completly shut off including the steering. The car swerved into another car's lane. After I started it again, and immediately drove to mccomb Chevrolet. They said it had something to do with the electronic computer, and reset the computer. The second time I was slowing to go around a curve and it shut off again, and the vehicle went into a ditch. My daughter bumbed her head on the side door. This time mccomb said they couldn't find anything wrong ,but maybe it was water in the fuel line. The third time I was slowing again around a curve and it shut off, and veered off the road. I have not called mccomb as of yet. This was very alarming and dangerous. I am now scared to drive it especially with my children.

I've taken my Trailblazer to the shop to check out the power steering unit. My power steering makes a grinding sound when cutting your wheels to park are if you are pulling out of a parking spot. I've talk to shop manager and they check it out and stated that they didn't find anything wrong with my power steering ,and as of today my power steering unit continue to make that grinding sound.