Djm900 nexus with latest firmware. Using my mixer, business as usual when the mixer just made a loud tone noise. So loud that even when I turned down the house board the noise was still going through. Turned the mixer off and turned it back on and worked like a charm, then 30min later it did the same thing. I've had this mixer over a year and never have had this issue . I found another post of the exact same thing but it had no answer.
http://forums.pioneerdj.com/entries/22833372--CLOSED-DJM-900-Nexus-channel-2-crash-shut-down
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@Dannywest > The other thread was closed for being dormant. Unfortunately it's possible you have a physical problem with the unit and it will need servicing. Please contact technical support via the links located at the right side of this page.