Mine does it too if I dont hold the clutch in when turning it off.
As the others have said pretty normal, its all over the M3 forums, and Im not sure the gearbox is the fix.
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///M3 CB/BLK Alcantara ~ OEM BABY ~
H&R ¦ Brembo ¦ Eisenmann ¦ CSL Bootlid ¦ CSL Interior ¦ CSL Diffuser ¦ CSL Bumper ¦ CSL Wheels ¦ AC Schnitzer ¦ Rogue Engineering ¦ Recaro
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