I had the same problems with my 70lb, my motor just quit while on the lake, took it to a minn kota service repair shop. I had two issues. One was the little magnet under the button on the foot pedal got recessed to far down, the tech told me if it happened again pop the button off and pull the magnet up some. Simple fix. I took it home put it back on the boat and nothing just a slight ticking noise heard from the pedal with no prop movement. So I thought maybe somethin was wrong with one of my batteries. Unhooked everything, tested both of them, all good. Even though there was hardly any corrosion, I clean everything, hooked it up and "WALLA"! Power! Problem solved, for now. Waitng to test again out on the lake