allright update,

it did not do it today.

My mechanic told me to turn the key to position 2, 3 times before firing it up and it fired up all the time. I also tried giving it some throttle when starting it warm (as the manual suggests)

so... it's fine.

however, I'm pretty sure if I just tried to start it normally it would've failed to start at least once today.

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2008 BMW 335i Coupe