DDJ-SZ white noise through headphone jack?

Hey All !!

I recently purchased the DDJ-SZ and have being pretty happy with it however recently i have gone back to using my Ultimate Ears UE11 In ear monitors and as soon as i plug it into the headphone jack i hear a loud white noise hiss.

I though maybe it was the 3.5mm - 1/4 adapter so i plugged the mini jack straight into the SZ same deal, i then thought maybe it was a problem with the monitors so i tried listening to music through my iPhone and no hiss what so ever.

Anyone else have this and know of any work arounds? I might add the SZ is running the latest firmware and the hiss exists even when no computer is connected.

Many Thanks 

Nick