E-8306 xdj-1000 Rekordbox 4.0.8

i ran into e-8306 problems consistently while using numerous USB sticks with Rekordbox 4.0.8 analyzed playlists.  XDJ-1000 (v1.05) would read fine in the beginning, after playing the songs will stop  ( won't read the usb stick at all) and sometimes pop out E-8306 errors.

 USB sticks formatted to MS-DOS Master Reboot accordingly via Mac OS Yosemite

However, if I only use drag files from iTunes or anywhere into the USB stick then everything works fine.

does anyone what the problem may be? 

thanks