I’ve never dealt with NI for taking stuff back, but from what I heard it’s actually a pretty easy process. I know NI is notorious for garbage tech support and customer service, but I’ve never once heard of anyone complain about having a repair done. I think they pay for all shipping and stuff and usually send you a new one. I’ve heard it usually averages about a few weeks total in time.
So my deck c and b started to live their own life. Seems for me to be dust. Not so strange after 1.2 years of almost every weekend playing on the beach with them.
Tried an older computer where i installed an older version of traktor pro, but that wasn’t the solution.
Already was thinking of getting an other controller because warranty is gone and it’s already been openend up to solder a new usb connector in it. But just tought well let’s just blow with my mouth into the opening of the faders.
And, al seems to be ok again. 
Mine has been ongoing for about 5 months, i havent bothered writing to NI as i assumed it was a software fault its only when i have looked at these forums and the problem has got worse and my warranty has just run out, how much do they charge for repair? You spend over £750, really and truthfully they should help me if im a couple of weeks over the warranty. Also how long do they take to get back to you?
I lodged a ticket about my fader. The next day I got a reply telling me to rename the .tsi file. Did that so I wrote back requesting a hardware repair. 5 days later they got back to me saying someone from the hardware repair department would contact me ASAP. 10 days later still no word. I’ve dealt with some shit technical support before but NI takes the cake. Will email them today to say hey its been over two weeks since I contacted you what’s going on.
Figured I’d real-time this support ticket. As soon as I post this reply I’m going to file the ticket that Fader A has a mind of its own.
2.5 Hrs later:
FIRST: Close Traktor and go to DOCUMENTS–>TRAKTOR 2 (your current version) and
delete TRAKTOR SETTINGS.TSI. Now you are ready to continue.
- Please completely uninstall the Controller Editor software. You can download
the MAC OSX UNINSTALL UTILITY to make this easier, from here:
http://co.native-instruments.com/?id=freeupdates
Then run the utility and select the CONTROLLER EDITOR software to remove.
- On your OS X system drive, go in the Applications>Utilities folder and
double-click the Disk Utility.
Select your system boot volume on the left (the named drive), and then click the
First Aid tab on the right and click the button on that page that says Repair Disk
Permissions.
This will take a few minutes to complete. This is a general maintenance routine
for the OS which is recommended to ensure the proper functioning of the system.
- Download and reinstall the CONTROLLER EDITOR 1.5.1 from here:
http://co.native-instruments.com/?id=freeupdates
- Launch Traktor and see if the controller and software respond correctly to one
another.
15 minutes later: that didn’t fix it. Replied back to NI informing them their fix didn’t work. No response yet.
Did tons of homework on the issue, broke the seal & took the thing apart, cleaned contacts on the faders (all of them) re assembled and the problem is resolved. 100%. No problem-o.
Lessons learned:
NI really have no staff - or no clue - or really could care less.
It’s a piece of audio hardware - not magic. A fader is a fader. I suspect had this been in external mix mode, it would have been “scratchy” and maintenance would’ve come sooner.
I had this problem, I fixed this problem, very quickly and simply.
The problem is dust and fine partials getting into your s4. I sprayed a metal lubricant into the fader slots, wiggled them around and now they work absolutely fine. Saved me a whole lot of time and money. Hope this helps, it is what worked for me.
I’m not bagging on your technique, DJMpress, so please don’t take this the wrong way. But, I can’t even begin to think about just randomly spraying “metal lubricant” into the slots and [inadvertently] across the many electrical contacts in this $900 device. I’m not saying it couldn’t or doesn’t work, but after opening it up, it seems like the hand grenade approach with far greater potential to totally fry the controller. Furthermore, it’s equally as warranty-dissolving. Then, there’s the nature of the “metal lubricant” in question. Plenty of that stuff is a solvent for plastics and circuit boards.
I can appreciate your concern HigherFi and thank you for your non judgmental attitude. I can say that the person who suggested such a technique is a qualified electrician and club owner who routinely fixes his own gear. I too was a little apprehensive at first but I do trust his word so gave it a go and no problems so far. Might not be the approach for everyone but it is the way I went. Thanks for your response 
Which product did you use?
i had this same problem recently, and fixed it by blowing into the fader… old school nintendo cartridge style!!
If that doesn’t work, I would suggest using “contact cleaner” on the faders. I bought some years ago at Radio Shack to clear up issues with my DJM500 faders bleeding sound.
peace.
Having the same issue. Thank goodness i bought the additional warranty through Guitar Center.
I do have a question however. How do i swap to make decks C & D my primary decks? Whenever i try to load a track into either deck it won’t load. I have switched them from remix decks to track decks but nothing. This is probably a simple fix i’m missing but can’t find it. Any help would be appreciated.
simply solution : CONTACT CLEANER .
I Had the same issue and now all is OK .
dealt with this problem for a few months with no fix. calibrating, cleaning, uninstall-reinstall all didn’t work. Finally contacted NI and they sent a replacement unit. Took about 4 weeks because they have had a lot of these returns.
CONTACT THEM BEFORE WARRANTY RUNS OUT
How long is the warranty? I can’t find their warranty statements anywhere on the website and I don’t think I got any papers of it. And how do I contact them if not by their mail? I mailed before the warranty went out (if it’s one year warranty), but I have not got any answer from them.
I have not been able to find their phone number either.
Please help.
I used some canned air with the spray straw in the fader slot and that seemed to work.
May I know what should I do if my warranty has run out?The S4 is causing big problems especially at the current space of time where I need it the most..
ps:warranty is for a year if im not mistaken,NO?
cheers guys
If your warranty runs out you can send it in for out of warranty repair. Cost for repair is around 120 minimum up to 400.
..It’s Hiotlers ghost. Yell Sieg Heil before every set and all will be forgiven.
here is a link to new faders if you are out of warranty and have a soldering iron it takes about 15 min to replace the faders.. usually when they starts jumping around it means the carbon strip in the faders are already worn down.. there is a link to some on ebay
Wish you posted those sooner… I had to buy some from China…