if u are using a laptop, you may need to disable usb power management
with a nvidia based computer/laptop go to nvidia control panel--> 3d settings--> performance change from adaptive to maximum preference
then change the buffer a bit more in your music player to see if it could solve the trouble?
I want to tell you guy's that i use Macbook pro 2014 Retnia and Coustm PC it's same thing i hear the click sound, And the player media is Foobar2000, jRiver 20 and Audirvana Plus for OS X.
Also i try DSD,192,96,44.176 same thing
BTW what is mean can you check the internal jumper they are correctly set ?
So i have retrun the NFB-28 yestrday to Kingwa and he well chack my NFB-28 its on way to Kingwa