Hello,
Please check this in System Preferences / Users and groups:

Tick OFF the check mark. (Here my DJM TOUR1 is shown).
Did it solve the issue?
Greetings,
Kris
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Every time I connect the USB cable from my MacBook Pro to the mixer, the DJM-900NSX2 Setting Utility starts automatically and this is really annoying because I have already set everything I need so I just have to quit the app.Any trick to avoid this?
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Hello,
Please check this in System Preferences / Users and groups:

Tick OFF the check mark. (Here my DJM TOUR1 is shown).
Did it solve the issue?
Greetings,
Kris
Toggle this setting ON/OFF from the mixer settings.
Oh yes! @Kris, that was the problem! Thanks for helps.