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I had a somewhat similar problem with my humminbird.... innacurate depths, sometimes blank screen, water temp not accurate. And this was after I had used it previously with no issues.
Turned out the transducer connection wasn't quite tight enough.
Originally I had it rigged with just the transducer cable coming through the hull and out of the FF mount, without using the cable connector holder.
I reinstalled the mount with the connector holder and it works fine now. Just had to fix the loose connection.
No idea if that is any help, but figured I'd chime in.
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