I have a Garmin 7612xsv with two GT50M transducers. This season the sonar keeps dropping out intermittingly and getting a "sonar module lost - built in" message. When it works it works well but now it's happening more frequently so I need to troubleshoot this. I did a software update and that seems to work for awhile but now it's back. Tempted to do the reset network option but not sure what that entails. Not a techy guy so would welcome any suggestions.