I not sure if this is normal or if I have a problem with my air suspension. When I am parked, or at a red light, when I press the button to raise the suspension, the light on the center console turns green and I can see the car actually raise up. I also get a message telling me such. After about 3 mins or so of driving, I notice that the light on the center console goes out and the car just seems to return to normal height. Is this normal or should it remain at the elevated height until I park the car? (Also, Im not driving over 40 MPH as I understand at higher speeds the height can adjust)