Hi, I use my DJC.4 since 2012 and it was very good. But currently the headphone button and the play buttons are not working well. Sometimes I have to push them 5 or 10 times to switch on or off. I think its a mechanical problem. What do you think? Should I make reset? I use Traktor pro but I think this problem is not connected to the software because use to it is working perfectly. Can you tell me what kind of buttons are in the controller? If its possible to buy it I would like to change it. Waiting for your reply Thank you.