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Hey William,
The main reason USB-powered mixers behave this way is that the computer is not delivering enough power over the USB to the controller. This can be caused by a number of reasons:
- bad USB cable or port
- computer's USB chipset doesn't provide adequate power
- other USB ports have devices drawing too much power
Possible fixes for you:
- try another cable or port
- use a powered-USB hub
- use a different computer
Let us know how it goes... it could be that the DDJ is faulty, but those are the more common issues which are pretty simple to troubleshoot first.