after reading this thread, I have given up Nordost Heimdall USB and I am now seriously considering 2 options instead, Lightspeed and Entreq Challenger.
Anyone compared these 2 before? I am dying for some opinion.
Did you mean leaving it disconnected even when starting up the DAC and computer? I am concerned for this, as I am currently using Aurender X100L as transport and it has only 1 USB port.