My Leaf had charged to 80% overnight and in the morning I took the kids to the local nature preserve which is about 20 miles away. After we were done hiking I got back in the car, turned it on and cranked the AC all the way up a it was 103F outside. All of the sudden the yellow and red triangle warning lights came on along with a message that said "Visit Dealer" popped up. I put the car in reverse and all the warning lights and message disappeared and none have come back the last two times I started the car. Any ideas?