CDJ 2000 NEXUS "NOW LOADING BUG)

I was selecting a track on the Primary CDJ 2000 nexus (USB) while the other CDJ 2000 nexus (LINK) was playing i receive  the NOW LOADING message on the CDJ 2000 Primary nexus Player (USB ), so I had to turn it OFF and ON to resolve this problem but yeah .. I cant do this manipulation when the CDJ (LINK) is playing

These are purchased tracks on my usb stick, so I don't even think this is the problem..

And I dont think we can find crashlogs on the CDJ or my USB (RB)..

Thanks

Fabio Simoné