I have Humminbird 535 that just started having vertical lines that look like interferance both above the bottom signal and up to the surface. this unit is about 4 years old and has been a great little unit until now. It has the quick disconnect mount that I swap the 161 with. I didn't try to swap them out but was wondering if the contacts in the base could be causing this. Has anyone else had this issue, and if so what did you do to correct?
THE BANDIT

