Hey. Tried searching to see if there are any other people with the same problem, but unsuccessful.

Anyway here is the problem. When I stop at red light and put my car in neutral, it sits quietly and then I feel a slight vibration through my seat. It happens all the time and vibration usually begins withing 5-7 seconds after stopping.

The car is 2000 gxe with 47000 miles on it, and warped rotors.
Anyone else has the same problem? Or do you know how to fix that? What causes it?

Thank you!