Trouble is,,interferance can come from anywhere. It might be in wiring, trolling motor, a transducer wired to motor, mega 360, wires too close to trolling motor power wires, on board chargers. You just have to search each imaginary possibility out sometimes and can be a real pain in the arse. I have no flashes when running mega 360 and Mega Live until I am in 8’ or less depth of water on a hard bottom. And I can live with it as it’s not extremely bad then.