If a trickle charger helps, perhaps you need a new battery or need the battery cable replaced...

I recall seeing some issues with the "iintelligent battery sensor/cable" on all models that are faulty.

You could check the battery with a volt meter after having it sit overnight to see if it's staying powered up or if it is down and all the systems are going into low battery mode. AFAIK, a low battery doesn't always trigger a low battery message on idrive.