Just joined the MB club last week. Took my boat out 3 times this week and on the second and 3rd trip I would randomly loose my speedometer/zero off screen and none of my rocker switches would work (heater, bilge, etc. it would only be off for a minute at a time and then come back for a while. Happens why driving but also did it once when we were just floating. Anyone have ideas what it could be?