Unfortunately, this thing has a horrible USB implementation. 90% of the time I can't even get it to connect to either my Macbook Air or my PC. It takes a series of plugging and unplugging both power and USB from both ends, turning off and on again the computer and the DAC, and lots of stressful yelling to get it to work. Then, 100% of the time, a Windows bluescreen ends my listening and we're back to the plugging and unplugging. At least on the Mac it stays connected once it's connected and mostly works (a couple of dropouts here and there with Audirvana), but that's not enough for me to keep this thing. It's too bad, because it sounds really good when it works.
Maybe mine is bad.