We've been having occasional zero off issues with our club boat. (2009 Nautique 196 with 300 hours) Several times this summer the boat accelerates drastically after coming around the east island then slows down below set speed. It always happens at the east end of our lake which has tall trees and it also seems to happen after extended use later in the day. we do have high tension wires over the West (opposite) end of the lake. The solution has been to shut everything completely down and then re-boot. The most recent issue was this past Sunday. On Tuesday, I brought my personal boat to use for the afternoon and evening and the same issue appeared. (2015 Mastercraft - 2 puck system) Same location, same time frame of the day, same symptons. I did the same shut-down routine and everything was fine for the rest of the evening. I'm thinking there has to be some kind of interference with the signals/pucks? Brewski Lake - Indianapolis, Indiana. Anyone have similar issues?