Yes, that's exactly what has been happening with my M19 Kodiaq - so frustrating. Dealer says battery is fine yet the charge runs out daily. If I don't drive for two days it's dead as a doornail. I'm getting the Fault: Electric Child Lock message PLUs no adaptive cruise control or Lane Assist until the charge comes up to a certain point (usually after driving for about a half hour, then stopping the car, locking it and then getting back in and driving). I've also had the "Warning: 12V battery low..." message as well as "Please check Safelock", "The ParkPilot is currently not available" and "Please activate main switch". When the batter is very low, the engine will just stop dead while it's running which is really dangerous. I have been deactivating the stop start as soon as I get in now so that it won't just cut out on me. Any help in listing things I could ask the diagnostics people to look at would be appreciated (I've had it in once already and they can't find anything. It's still covered under warranty.