teebone, same advice to you. when you take it in make sure they file a engineering ticket directly with bmw. if a software fix is near, fine. but if not, then this is the only way to get bmw's attention.
for me, it has happened even with a full tank of 93 octane gas (the only grade of gas i use). the warmer the weather, the more likely. smoothly shuts off and smoothly turns back on. never any sputtering when taking off again. pretty much sport mode only. if it does happen in normal mode, then that's a very very rare occurrence (as 95% of my driving is in normal mode and i have never seen it in normal mode).
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