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Okay, so then it’s not your install. We can cross that off the list.
The next thing to do is check components while we wait on Garmin to see what they have to say. Hopefully their customer service is as good as Humminbird.
Do you have spare cables you can swap out? Do you have a unit you can swap out?
Next thing: I’d check those connections for the tiniest amount of corrosion.
Thing after that: is your unit getting good voltage? Some of these units will act wonky if they’re not getting good voltage and *clean* electricity, which I do not know how to measure/detect.
I know my units started behaving better after I put them on their own battery separate from the house/cranking battery.
You can test this by swapping out batteries. Check the battery the units are currently using for full cells. Pop that plastic cap off the top and if the cells look dry then fill them with distilled water. Do not use tap water. Wear protective wear when you do, a drop of batter acid flying in your eye will ruin your day. You do not want that smoke.
In the past I’ve had a Humminbird unit that was by itself defective and had to be sent in to get fixed. It came back a couple weeks later working like new. I backed up all my data and wiped the unit before sending it. You never know, there could be an LAFB-fan at Humminbird and he ain’t getting my spots/tracks. LOL
