Now that I've upgraded, the ultrex 360 has interference whereas the non-ultrex did not. It is constant, so it shouldn't be the trolling motor. I turned off the onix at the console, so it isn't causing interference. I wrapped the end of the Ethernet cable around a ferrite ring. I don't have anything else running. I can't figure out how to clear it up. I've turned the noise filter up to 5. It's lessened the starburst/asteroid effect, but I want it gone. Any ideas?