Hello, i have a Traktor Kontrol Z1 that i use on my MacBook Air with Traktor Pro software. I use it in combination with the Kontrol X1. When i'm Dj-ing the Z1 goes in freeze after a few minutes. I find this very big problem. I already tried to put in the AC adaptor but no difference. I have to unplug the usb cable, put it back in and it restarts. Again good for a few minutes. Does anybody has the same problem. Please help me out. Thx!