The past two trips my sonar on my console unit has been jacked up. This is the basic 2D sonar ducer. It can read water temp but can't display the bottom or anything in the water column. Is it possible my ducer went bad? I checked my data sources and all are where they're supposed to be. I also put it up on the bow to check and it was able to read the HDI ducer up there. Is there anything else that I should do/check before I start ripping my bilge apart (which will be a project)?