My 602S has been working fine, until recently. Or maybe it's still working but trying to tell me something. We're liveaboards and at the dock on shorepower the majority of the time. House bank typically shows 100% SOC and infinite TTG. We left the dock for the weekend, and the volt reading quickly dropped to 9.xx although when I put a digital meter on the batteries they were still showing 11+. We returned to the dock/shorepower, and now the BMV isn't showing any SOC or TTG. I have suspicions, but looking for some education on this.