Good thought on the hill idea, now that I think about it, I may have been coasting downhill when the bars disappeared. Still, I was on level ground in my garage when I restarted it and the bars were still gone. It wasn't until the next day and charging overnight that they came back. I'm probably going to have my 12v battery checked just for peace of mind. I've read on here that the computer can do little glitchy things when the 12v is nearing end of life.