My 1998 BMW 750il has a problem. When rounding a sharp curve at a fast speed sometimes the power steering goes off! When this happens I feel a small jolt in steering wheel and no more power steering. When car is turned off and restarted the computer resets and power steering works again. Often times the check antilock brakes light comes on in dash. Also on a possibly related note, the antilock brakes are sometimes activated when the car is started early in A.M. and I am driving on a smooth surface at a slowish speed. I can feel this through brake pedal and also hear this. The check antilock brake light comes on for this also. The dealer and local mechanic cannot solve the problem. I love the car. Has 148,000 miles and otherwise has been a nice car. Very annoying. Can anyone help?