Xdj aero looping issue

Has anyone come across an issue with looking desyncing music while mixing. I recently got the xdj for Christmas and cant understand why this keeps happening. Anyone know how to Fix it? 

Useful information: recordbox 4.0.5. All analyzed. Firmware up to date on controller. Music connected via usb stick. 

Mixes start perfectly sync with sync Feature. Then after loop completes the Music desyncs more and more Each loop. Maybe I'm doing something wrong but I never had loop issues with muy rinkydink previous mixer.