Same issue
I'm just back from my 2nd visit to the dealer with the same issue.
Right after my service, driving of the lot !, I felt a misfire and the engine went to in 'limp mode'.
They diagnosed it to be a bad plug and replaced it.
A week later same issue and same diagnosis on a different plug, different cylinder.
There's something wrong with a batch of BMW plugs if this is happening.
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