Sandra,
I have a Mini Copper 2011 convertible with the same problem. Someone told me the Hall sensors are to blame. Just had the timing chain replaced for $1500 so am not ready to fork out another $1000 - $2000 for a top repair. I don't think its something I can fix myself ! My handle is Love because I love this car but Hate is for the expensive repairs and BMW making everything so #[email protected]! complicated.