I have a 788cihd combo mounted on my terrova at the front of my boat. Last year I had rf interference issues with he 788 which were solved by getting a new power cord from h-bird. Recently connected my 998 hd di combo at the console with Ethernet cable. RF issues again on the 788 when trolling motor is running. Have tried disconnecting the Ethernet cable from the 788 as well as playing with all the settings. No luck.

Very puzzeling problem. Any suggestions would be appreciated.