Reply to Buy a new s4 without software?

Hello, i bought the S4 sometime last year and it started to glitch out and only had it for about 4 months, i was able to use the warranty wich sucked because i really barely got to use it. Anyway Native Instrument replaced it with a refurbished one that is all scratched up and it really killed my vibe that they did that to me. Now this Refurbished S4 is starting to glitch out and I'm just wondering is there anywhere legit that i can by just the S4 controller brand spankin new.

The volume fader on the first track(Deck A) moves up by itself in the traktor software when the psychical fader on the S4 is all the way down. The is the current glitch on the replace/refurbished S4.

I did re calibrate all the knobs faders and jogwheels, still the problem persist.

Any feed back would be appreciated, Thanks