e-8302: player error (c194) cdj 2000's problem

hi i am using x2 cdj 2000's a djm nexus 900 and toshiba dual core 2ghz laptop 4 gb ram nothing else running also with a netgear 10/100/1000m switch with pro dj link to recordbox, the problem is that the cdjs seem to freeze then couple of seconds unfreeze and then this error just appeared really bugging me this now whats going on, have also tried just linking the x2 cdj2000's together via ethernet cables the player with the usb in works fine but the player with the link on recognises the usb and the tracks but acts really slowley and will not let me play the tracks??????????

recorbox - 1.5.2

cdj2000 - 4.10