Two things happen at the same time. While I'm pedaling the power from the motor cuts out momentarily. Then in those moments, the mastermind display doesn't turn off, but the miles per hour drops from whatever it is to zero. Then if I keep pedaling, the power starts up again and the mastermind display starts acting normally. I did do some research and found somewhere on the internet with Creo 2 trouble shooting info. Two possibilities I saw there are cadence sensor issues or the motor overheating. But who knows? I suppose the other issue to mention is the motor doesn't seem as quiet as it did when I first bought it. It's a new bike with about 300 miles on it. I'm going to let my local bike shop figure it out. They're awesome folks and I've got a good relationship with them. My favorite bike mechanic at this shop gets back to work from vacation sometime this week. I'll probably bring it in towards the end of the week.