Thunderbolt Soundcard noise (RME Fireface 400)

Hey,

I wonder if anyone is having the same issues, but since buying a new macbook pro I've been experiencing a high pitched digital noise in all sound going through the RME Fireface 400. I've used 3 different power cables, 2 thunderbolt cables and the noise is still there. Everything's up to date regarding software and firmware. It's really annoying. Anybody manage to fix this Id be very grateful?

Thanks!

David