I have a problem with my 2012 SF 2.0 CRDi FWD, it has been equipped with a start/stop button. When i first used it from the time i bought it to now i did not notice any problems about it (perhaps i didn't pay attention to it) but now i realize something about it. When i push the button for starting or stopping the engine (when starting: push the button + press brake pedal) it does not start or stop promptly, usually it requires me to push the button twice, after that it will start or stop normally. I have sought in the manuals but i did not find anything related to this problem. I don't know if this is normal or it's a sign of abnormal problem, if you have experience about this problem, please tell me!!!