Noise on Line Inputs UR 22

I am having an issue with some type of high-pitched noise interference on the line inputs. When I plug in my synth the noise is very noticeable. When plugging in a bass, the noise is less pronounced yet is still there. I noticed that the noise gets louder with proximity to the unit.

http://www.steinberg.net/forums/viewtopic.php?f=157&t=79396#p452186