2013 Mazda 3 Engine not turning off while pushing the start/stop button

My 2013 Mazda 3 does not turn off the engine while pressing the start/stop button. If I continuously press the start/stop button for three or four times then engine stops and goes to the acc mode. This problem occurs when the car runs for sometime after starting, immediately pushing the button after starting turns the engine off although. Anyone else had the same issue? this seems a strange issue..please advise what might be going wrong..