I have not heard of that issue but if they are regen drives, make sure the verr test point is zeroed out with the potentiometer. If it isn’t a steady vibration try tapping/wiggling the little IGBT plugs while the car is running. If you hear any difference from the drive replace the harness. They can be flakey, especially when they are shoved on too far. Beyond that, get a scope and go through the ride quality adjustment section of the 50-04 manual.