XDJ 700 HID REKORDBOX CRASH

 When I use my xdj700s it works fine for about 40 minutes linked up to rekordbox but out of nowhere the sound will distort and rekordbox will crash. this happened to me live at a gig and it's very frustrating. 

running all the latest firmware and software.  

my mac is running on a Samsung 500G SSD and running on 4Gram.  

Serato and Traktor work perfectly so it is not the mac that's the issue.  

Anyone had this issue and found a solutions ?

THANKS