Sounds like you have a version of my ongoing, recurring problem. You can read about it here:http://www.mynissanleaf.com/viewtopic.php?f=30&t=14617. Disconnecting the accessory battery negative cable for a few minutes will fix it for a month or so. Take it to the dealer and ask them to check the parasite drain. I've been wanting to do this for some time but haven't been able to get it to them while the car is acting up.
Meanwhile, to avoid any possibility of "double pressing" the power switch, always shut your car off with your foot on the brake. That way, if you do double-press the button, it will go back to ready mode and you will know. Good luck, Bill