Sinamics V20 - when we stop it from switch it stops but the moves a bit that displaces the object

I have a bit different challenge.

We are using V20 to drive an induction motor It works fine just one problem when we stop it from switch it stops but the moves a bit that displaces the object say by  2 mm. We want to stop it instantly. What should I do thanks in advance 

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Split from How to control motor break with Sinamics V20.

Please check below points. -

Is load intertia too high?

Is external brake applicable? Try by tightning it.

Try by reducing ramp down time P1121. 

HTH.

Thanks for your reply will try soon