I have a 90 535ia with 110k miles on it. The car runs really good except for occasionally it will start to make a lot of noise after running at 45mph & above for 20-30 min. Then when you start up you here clicking from under the car that goes with wheel speed. We think it is the heat shield rubbing against the drivetrain. It was adjusted but after 3 months the problem has come back. Anyone had similar problems or know what the solution is?