DDJ-RR FX Issues

Hi all,

My right FXs are playing up with the slightest of touches...

Issues-

FX1- Turns all FX full whack, full rotation has slight effect on all 3

FX2- Turns full whack and sometimes all- no rotation effect

FX3- turns on 3 1/4 full and full rotation of knob has slight effect in rekordbox

Even if i turn them all off in the software and the controller rotary button is still fully turned on, by turning it backwards (off) it will turn the FX on full.

I have read a lot of the same issues elsewhere, surely pioneer this must be a hardware fault? something breaking down? voltage leak across the switches? 

What are your thoughts?

Many Thanks