Popping noise/sound degradation

i am using xdj-700 with the latest version of rekordbox, after 15 minutes i get the popping, 20 minutes in i have to cut it off.  I thought the latest version of rekord box was suppose to fix this.  What is the fix?  I am running it on a MacBook Air 2017 with Mojave on it.  Meets all requirements for the software.  I have the reloop rmx - 90 mixer.  Everything is updated.  When i run it off the usb sticks i have no problems only in performance mode.