
Hi Phil,
I have been using the XDJ-R1 for a long time , and have experienced some of these problems myself,
try going through this list,
Download the latest Firmware to 1.09 (Tutorial's on Pioneer Dj site or Youtube), and restart the unit,
Change the Mixer setting from PC mode to XDJ -R1 mode,
Make sure that your Rekordbox Library on your PC is set in Preferences to XDJ-R1 and not XDJ Aero,
Re-scan all your songs using Normal mode and not Dynamic, (setting's are in Preferences),
And most importantly, try another good quality flash drive e.g Sandisk with minimum storage of 16gb
Hope this works,
Adrian.