Have a 2004 Motorguide Model FW-FB 46 that is about 10 years old but had very little use. On extended runs of 2-3 continuous minutes on higher speeds, it automatically shuts off. This usually happens when it is very windy. After sitting for a bit it will work fine again. Not sure if it is designed this way or not, but I don't remember it doing this when I first bought the boat 3 years ago. Have replaced a couple of the micro switches in the foot pedal but that has not helped.