The 3 series suffer badly from camshaft sensors and on your vehicle crankshaft too. Replace all three sensors and your problems are gone. You will notice that the old sensors have a step in them while the new modified ones dont, good luck
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It can be related to the transmission repair such as power ground not being sufficiently connected,because this is intermittent,There is also a Technical bueletin from BMW about power loss, and no crank situation No. SI B 12 03 06, engine electrical system
Sounds very suspicious of a failing alternator. BMW alternators are notorious for failing when hot. I would high recommend having the alternator checked while hot..ie after a long test drive. Usually the voltage regulators fail, but I would recommend the entire alternator. Both Bosch and Valeo brands are usually interchangeable. I would recommend the cheaper price of the 2. It could save you a few hundred dollars.
Hey, sounds like a vacum leak - common on those engines. when engine is on idle open boonet and lissten out for any whoosing noises near the rear of engine. There is a breather there that can be changed ( black round ) or check the pipes that connect to it coming from rocker cover for damage.