Reply to Maschine + Traktor MIDI mode fail?

I don't know why but for random reasons the traktor pro 2 software stops reading the signal from the maschine in midi-mode used as a controller in traktor. This is quite frustrating as sometimes I can go a whole 4 hour set without any hiccups, than the next day it will stop picking up the messages 6 times in 30 mins. When this happens I unplug the usb and plug it back in.

I am using a macbook pro if that makes a difference. I am able to run maschine in software mode no problem and create beats all day, but once I try using it as a midi controller for traktor it shits out on me!

The contoller manager still picks up messages so it is traktor that is the problem. Why is this??

Anyone have any suggestions?