Pioneer DDJ-Sx3`s Fader Problems

my ddj sx3`s fader just recently started to act wierd and now its to the point that when i cross from right to left on the fader it still plays songs over it. i replaced the fader twice with new ones one from amazon the second one from innofaders and it is still doing th same thing. everything else works perfectly fine the only problem i have its the fader from the right deck playing on a and b and also in thru. i updated the firmware and also have the latest serato dj. please can anyone help me or point me in the right direction.

here in pennsylvania i cant find anyone who can service them or do repairs on them i even tried searching google and no luck. please help thanks.