Thread: Solid line at 2 ft

I moved a basic FF from back of boat to front, mounting transducer on trolling motor. There is a solid band that appears at 2 feet and stays there regardless. Does anyone know what might cause this? It appears both on the water and in the garage.

I've tried reseting to factory defaults, no difference.

I don't think it's trolling motor interference because it happens even if trolling motor is unplugged.

Any ideas?