I too have this issue. It started with DSC errors while on the highway, then the time reset, my dash dimmer reset, more DSC and ABS errors. Then a random over charge error and now my comfort access wont work and as of 5 minutes ago my battery says its low.
Considering my car is only 2yrs old with 17K on it, Im starting to think my remote wire trigger might be the culprit. Im using the one behind the rear seat which doesnt exactly shut off the second the car is turned off.
Can we just get a yellow top battery in our cars?
///2013 AW 6MT E92 ZCP M3/// Black 359M Wheels/BMW Performance Carbon Fiber Spoiler and Mirror Caps/Arkym AeroSport Front Lip/Turner 15MM Spacers/LUX 8 LED Halo/IND Gloss Black Grills, Gills and M3 Emblem/30% 3M Tint/BMW Interior LED/MusicCar Subwoofer Enclosure/JL Audio 12" W6 Sub and XD600:1 Amp/Euro Sunglasses Tray/Ceramic Coated Megan Racing Exhaust/AFe Dry Air Filter/RPI Intake Scoops/Euro MDM/Feature Coded.