Thanks for the info, @XGTG-yokelet, and apologies for the troubles.
So I can have a better idea of what may be happening, 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.
Can you confirm that this behavior is happening with all endpoints, or is this only happening with that specific DAC?
Since noticing this have you tried power cycling your Core machine and endpoint and see if there’s any change?
Thanks,
Dylan