I'm experiencing the same issue. Except I didn't get any weird idling or anything that seemed wrong with the engine. Just a drivetrain malfunction 3 times in 2 days. Took my car to the dealership to get a diagnostic test. Found cylinder 4 misfiring and turbo coolant lines leaking. I'm aware that there is come kind of service recall for the coolant lines. The dealership said my VIN wasn't covered
. I bought my 2013 M5 around 2 weeks ago with about 57k miles with an extended 3rd party warranty. Test drove it and everything checked out fine with a nice car fax report to back up the services done to the vehicle. I'm guessing it's the spark plugs, coils, or an injector? But I guess my luck ran dry 2 weeks and about 1000 miles later.