I have a NavNet 3D with a high definitionRADOME radar, which is installed in my Amelit 54 Yacht. When pressing TX it returns to the standby mode. The problem seems to be a intermittant problem.It only works a few minutes and then the problem returns. I have had this problem since Furumo technicians changed the depth sounder which has never worked properly. I think the processor needs to be replaced. I have been in contact with the Amelit any suggestions? My email is kaj@amelit.thanks, Kaj