Problems with djm-900 nexus sound card

Hello. I have a DJM-900 Nexus and after the instalation of the firmware 1.4.1 the sound doesnt come out properly. It was the first use of the mixer and the sound it comes out with cuts and the buffer on traktor is at 512. please help me with this issue because im not able to use the mixer.

I use mac late2011 High Sierra

Kind regards,
Patricio Pinto