Hummingbird 525 Problem

Hey.........I have a Hummingbird 525 mounted on the front of my boat.

I have a trolling motor transducer, and every couple minutes, or so, I get a vertical line that starts from top of the screen to the bottom.

I've tried moving the transducer, etc, etc, and it does not seem to matter if I'm using the motor or not.......

Any ideas?

Thanks,

Geo