Deck speed problem

I recently updated firmware + Rekordbox to version 5.4.3 for DDJ-RR.

Now when I mix from the right to left deck movement of the crossfader causes speed adjustments on the left deck, usually by +1 / -1 but sometimes more thereby ruining the mix. It does not happen when mixing from left to right.

Has anyone else encountered this problem and can you please advise a solution?

With thanks