Hi @KnockKnock,
Can you elaborate a bit on what you’re seeing here? Can you share a screenshot? How often does this occur? What were you doing leading up to this?
Have you tried rebooting your Core machine?
So we can better assist 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.