Looks like a voltage problem. Either the voltage regulator on the alternator or the voltage supply in the ebox I forget the name of it I don't have one on the 3.0.
Get voltage display real-time on the dash hidden menu and see if your voltage is stable like 13.2-13.8 and never outside that. If you get dips into 12v range especially when you coast towards a stop most likey your VR is shot
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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