I had...actually have the same problem.
It disappeared after the first service when the changed/mixed up the left and right caliper.
The mechanic told me that the left and right caliper where from different packing units and had a slight measuring difference.
So he mixed them up and it worked. ...but after a couple of hundert kilometers my M3W started again to breakout to the right side.

So I still waiting for an solution...
But it seems Iīm not the only one with this problem, especially they all breakout to the right side.
Curious isnīt it?