Front Air Bag Sensor Control problems of the 2000 BMW Z3

The srs air bag warning keeps coming on. I had the opportunity to have it looked at the BMW plant in south carolina where the car was manufactured. A technician from the factory investigated the problem, reported that nothing was wrong and that it was just a malfunction. He reset the srs air bag warning light. The next day it came on again. The dealer can rest it again, but it just keeps happening. I am concerned that the airbag may not operate during an accident.