Thanks for sharing your report with us, @Ultrarunner.
To start, may I kindly ask that you please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Does this only happen when playing to this particular endpoint? If you connect the QX-5 DAC to the Core machine directly via USB and just play to it, do you experience the same behavior?
Thanks,
Dylan