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Hey Waut,
I'm sorry to hear about this issue -- typically it occurs when the DDJ is not receiving adequate power over the USB connection. Please try using a different USB cable, a different port on the computer, or a powered USB hub. If you still have issues, there is always the chance it's the DDJ itself. In that case, please file an inquiry ticket here and our support team will gather some additional information to assist you in resolving this issue.
Rubim,