I had a simmilar issue with the crossfaders of my DDJ-SX2,
thanks to “Slak_Jaw” the fix was make sure your toggle switches at the bottom of your channel faders was set to either A or B and not “Thru” make sure you do this to all the faders, toggle the switches to either A or B,
Once I did this, I never got that popup and DJay never crashed,
Here is my original post, DDJ-SX2 (Crossfader assignment changed) issue
Thanks to the Man Slak_Jaw
I hope this will help with your issue:)
