I have an old wooden flashforge creator. It's currently on a shelf awaiting either tearing down for bits or fixing.
Same problem as yours, I 'think' it's the stepper motor drivers.
It's unlikely to be athe actual motors themselves, so the obvious culprit are the drivers, but as i needed the deskspace for a new printer I've never bothered to fix it.

But exactly the same issue. Stepper drivers is my snap diagnosis. :-)