I have a new setup in my boat, helix 10 G4n SI at the console, helix 10 G4n DI at the bow, 24 volt terrova with iPilot link, all connected through a 5 port hub. The bow unit doesn’t see the SI, I get a message that says the side imaging source is lost. I have replaced the Ethernet dongle and extension cable on the bow unit. The hub seems flaky, if I plug the bow unit into some ports on the hub the bow unit doesn’t connect to the terrova even though the console unit does. I have 12+ volts at the bow and hub. What could be wrong? Bad network hub?