Pioneer have made some updates now.
Go check Pioneer's homepage/support/updates
... and see if your product have made an update.
My Pioneer products work flawless, for 3 weeks now.
I have been running Pioneer DJM-900 and Denon DN-CS2000-MIDI kontr.
Belkin USB-hub 4-port.
OS X El Capitan 10.11.2 MBP-13" From 2011 With 8Gb-RAM
I alsow have CDJ-900-(no Nexus) and even they work. But CDJ-900 haven't i run so mutch, only... like 5 Hours total. In 1 hour at the time.
I'm trying out now att christmas-time at home, my MAC, connected with Pioneer DDJ-SR-MIDI Control. Than i have chosen MIDI mapping for DDJ-SX. Thats the closed mapping alt.
It's works flawless. (4 the moment) i've been tried this out for 1 week now. In 2 hours at the time.
I alsow have Pioneer Remix station RMX-500. Even this machine have an update, for MAC OS X 10.11.2
SO.. Go check your Stuff and update's...!