My 520d bought new in March 2013 has been perfect until I took it across the North Sea with Stena. On getting back in the car at the Hook of Holland ready to drive off after about 7 hours, and switching on the ignition it said 'increased discharge when stationary electrical consumers use temporarily suspended'. Nothing had been left on but it had indeed gone into partial electrical shutdown mode. The fault cleared on trying a few minutes later, the car started and off we went.
On holiday in Germany this fault did not re-appear, but when returning to Harwich in the Stena ship (after about 900 miles and no fault), and getting back in the car in the ship's hold ready to start it, the same battery fault message reappeared!
I had been particularly careful to make sure that everything was switched off in the car again. That second fault happened a week ago and this message has not reappeared.
So it only happened on a ship, but it happened twice. Stena say they do not put cars into safe mode electronically, and BMW service and help line can't suggest anything.
Has any clever person here got any ideas?
Loved the autobahns by the way!