Has anyone out there experience they can share on the use of an Optimate 4 DUAL CANBUS charger with the new R1200 GS LC. I bought one to plug into the aux socket. At first it charged correctly but it sustained the maintenance cycle for only 2-3 days before it showed a red condition light and failed to trigger the CANBUS. I have to leave it for at least 3-4 weeks to discharge without running the bike before it will connect and charge but you can't leave it and forget it as advertised. Anyone else got any experience of this item on this bike?