thanks for the input, i'll leave everything as is for now and see if it comes up again. if it does then i'll start investigating further.
with my 07 335 i got that 2-3 times in 3 years of ownership so it wasnt a head ache, however a friend of mine had it on a regular basis with f30 335 and had to lemon the car because bmw couldnt identify the issue
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