On my E92, the start/stop has a mind of its own. In the 7 months I've had the car it's never activated start/stop at all, I never turned it off I just figured it'd perhaps been remapped out, Yesterday on a long drive it started turning engine off at lights and showing start/stop on dash.
It's not something I miss or want so I'll just turn it off using the button on the dash but should I be concerned that its intermittent/faulty?
It will only do it if a set of criteria is met, one of which is battery charge level over a certain amount.