Hi - I have a Furuno VX2 Open Array radar (2006). This weekend while fishing overnight, the radar unit would go into standby mode but the radome would continue to spin. I have 2 10 inch VX2 and it did it for both. I would then hit power and radar and it would continue to display but then a minute or two later it would happen again. Kept doing it all night. In the day running in from offshore, it seemed to work fine. However, a day later while on shorepower and sitting at dock, it did it again. Any suggestions? Boat batteries are 1.5 years old and there are 4, 33-35 foot Grady boat.