using traktor s4 sound card with cubase 6

I am trying to use the sound card from the traktor s4 as my audio device in cubase 6.0.7.
Everything runs normally for a few minutes then the AUDIO crashes.
Cubase still seems to run fine but the faders are empty during playback and the crashed audio is a loud noise that you can’t get rid of.
Cubase then crashes when you try exit.

Are you using the S4 ASIO driver?