When the vehicles power management system see's the battery power level get below a certain threshold it cuts off consumer loads, to ensure you have enough battery power to start the vehicle. If it see's a draw on the consumer load circuit it first cuts the loads for a second to "reset" it all and see if the draw goes away, if it doesn't then it cuts it off till you start the car.

If you drive lots of short trips the battery charge level could just be low enough to trip this every night, and charging it would get things back to normal for a while. Otherwise it could be a battery getting old and not holding a charge as well or an active problem such as a draw. May be either time for a new battery if it is 4+ years old, and OEM battery is recommended on en E70/E71 platform, installed at the dealer so they can register the battery replacement in the power module. (it adapts to the aging battery and if the new batt isn't registered it usually only lasts about half a year)

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