Hi, i have trouble with one of my pololu A4988 stepper drivers (mounted on a sanguinololu board on a RepRap 3D printer). I get a loud "clicking"
noise from one of the steppers, and it seems to be coming from one particular pololu, i have tried switching motors and the sound moves to the new motor, and tried switching places of two different pololu A4988 and it always stays with the same A4988 driver.