Help with Humminbird 598

Hi. I just install my Humminbird 598CI Si combo. I went on the test run, at first it was working showing the side imaging. As I go half way the lake, the screen is starting to show white line through the middle of the screen and it would show a blank screen with 155ft when I'm only on 4 ft of water but it still reads the temp. and the mph correctly. I touch the transducer and it would work than at time it would not work again. What can be the problem?

Welcome to BBC. Post your question here in the Humminbird section. You might get an answer a little faster from those guys.

Humminbird Sonar/GPS

thanks