Buzzing/Hum DDJ-SR

Hello Support,

Please help me out with my ongoing issue with my DDJ-SR.. I am using the following setup:

x2 TRS cables from MASTER OUT1 connected to my KRK Rokit5 monitors which works good, no buzzing no hum..

x2 RCA cables from MASTER OUT2 connected to my NIKON d5300 mic Input. I chose this option to record my mixes trough an external software including audio and video on my laptop. This is where the problem starts, I am hearing constant buzzing in the background coming out from Master2, to isolate every suggestion I found on the forum I have disconnected the laptop PSU, every USB port which might consume more power so it was only the DSLR camera (which has its own battery and the usb is used only for AV), I have tested as well with connecting my phone out to the camera in and the buzzing was gone, sound was crystal clear so the issue is definitely with the audio out 2 on the DDJ-SR .... please advise if how can this be fixed,

Kind Regards,

Vlatko