[xbmcaudio]

All results are with unchanged setup. USB port is the same, cable is the same. I just stop one application and start another one. I even run Performance monitor from remote host. So XBMC runs in foreground. If you look at (for example) 44KHz screenshot you'll see that average data rate is 264,253. That's actually fine because sample rate is 44100*2 channels*24bits per channel=264,600. But at the moments where Transfer error occurs data rate is about 222,500. And there is audible pause in playback.
I hope this helps. And thank you again.