Can't help... but I too had way too many issues with the XDJ-XZ, so this was me last message to Pioneer support:
"...the XDJ-XZ device & RB are simply not up to scratch (I'm doing what feels like beta testing here for a fairly expensive product you guys released to the market way too early, firmware as well as RB software version wise...), I'm returning it next week and will ask for a refund."
As well as "seeing the d*ckmoves Pioneer is pulling off - i.e. 'product segmentation for higher-tier markets' being the reason for no flac support for the XDJ-XZ..."
All of this is not a good look, and this will stick for a while and I'll think thrice before touching another Pioneer product...let alone purchasing one.
c.