I am having the same issue. I don't believe it is related to charging, or temperature, since the issue began last week around 30+ degrees when it has been much colder here over the past month. Here was a related thread, it seems to be describing the same issue I'm having,
http://mynissanleaf.com/viewtopic.php?t=23115
My situation: car was not plugged in, just in a parking lot while I was at lunch. Press the lock button on the drivers door, get in, sit down, press brake pedal, press start button, car goes into "Accessory Mode" but won't go into "Ready Mode" (green car for driving). Turned it off again, tried the normal starting procedure again; press brake pedal, press start button, goes into Accessory Mode.
I tried maybe a dozen times, pressing the brake pedal very firmly (all the way do the bottom), but that didn't seem to have any impact. Eventually, it did just start up as normal, with no indication of what was previously wrong, or why it worked this time. I think I noticed the blue light around the dashboard (and all dash lights) flash off/on before it was in Ready Mode.
I was able to start the car again that night, the next morning, leaving work (after being plugged in to the ChargePoint CT4020 at my office), but then the problem cam back again on the second evening after I got done with a meeting. I came back ~2 hours later, it started up just fine. Drove home, turned it off, went inside and realized I should take to the dealer for service, back outside, and it started up just fine again. So having intermittent non-starting is a significant concern, especially since there were no dashboard indicators or warning messages of any kind.
It's at the dealer now, I'm hoping they can diagnose and fix whatever is wrong.
Thanks,
Eric
Omaha, NE
2015 Leaf SV
14,300 miles (as of 2017-01-23)