External soundcard makes clicking noise after a while

[yphoenix]

Hey guys,

I have a problem with my soundcard. It's a Line 6 UX1 external soundcard and I've installed the latest drivers.
Speakers and cables are functional.
The soundcard works great but when I listen to a song and stop, the soundcard makes a clicking noise after 1 or 2 minutes.
When I start the music again the noise is gone. So it only happens when I have no output.

My System:
Mac OS X 10.8
Gigabyte Z77-D3H
Intel i5 3570k
Sapphire 6870HD
8 GB RAM

Thanks for help!

 

[mt025]

What kexts are you using?

 

[yphoenix]

I used DSDTfree installation with TRIM Enabler, PS/2 and maolj's AtherosL1CEthernet (MultiBeast)
Then I installed Erton USB 3.0 (PXHCD.kext) with Kext Utility.