Seems unique to his system. Could be driver conflicts, bad USB ports, slow PC, etc. RME has one of two good USB implementations integrated into a DAC that I trust (Schiit Gen 5 being the other. Soekris is said to have good USB as well). It's the first DAC in a long time that I actually use the USB instead of feeding it SPDIF. I do have an Allegro USB card that I bought for no good reason (I wasn't getting dropouts in Windows 10). Anyway, I generally see nothing but praise for the USB on this and other RME products. They make pro gear that has to be 100% reliable.