Mazda CX-5 2016. I get into the car press brake pedal and press start button. Nothing happens for a few seconds and then alarm goes off. Fob does not disarm the alarm at this point. Only disconnecting the battery does. Reconnect the battery and then everything was fine. This was a week ago and everything normal since. Got into the car today and the same thing happened. Disconnected battery to get alarm to stop. Could hear some intermittent clicking under the hood as I was disconnecting the battery. Haven't re-connected again yet since I was in a hurry. Seems electrical but not sure.