Wow.. you guys are still having this problem?
I had it with no MHD but latest BMW software. In the end i just stopped monitoring the voltages because it was causing unnecessary anxiety. If no control units log undervoltage faults and everything else behaves normally, i just put it down to part of the brake energy regeneration behaviour. The more frequently the car is used for medium to long journeys, the more likely it will occur due to the battery being maintained at a higher SoC.
But those of you with MHD and experiencing limp mode etc, that might be worth discussing with MHD.
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