Did you lose electrical power or did the engine stall causing loss of power? If the engine stalled, there is a known issue with the engine management software. This was fixed by Bmw in 2010. There is a tsb about this. As you know, random engine stalls could cause loss of life. Bmw should have issued a safety recall but did not. Also the stall did not through any fault codes and that made diagnosing much harder. The hotter the weather, the more likely the chance. Also, sport mode made things much worse.
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