I have own my como 4.0 for over 2 months now, I have had this problem happen to me 2 different times while ridding the bike. I push the battery power button on and start out in the ECO mode. I had some wording come up on the monitor screen. I don't remember what it said. So I shut down the main power and turn it back on. The screen was normal and I was in the ECO mode. Still no power. So I decided to do a short ride with out the power. After a mile the power assist came on. I thought this was a little strange. Maybe a one time glitch. It happen again a month later. I started out with the bike in the ECO mode. I thought my legs were really tired from ridding from the day before. No that was not the case, no power again. Everything looked ok on the screen showing 1 bar for the ECO mode. After a while the power was back on. Has anyone ever experienced this before or should I take the bike in to have it checked.