My e-zip does this occasionally but not often. And mine occasionally won't kick in until I pedal a little. What I have done to stop this is turn the power switch off and back on. This seems to reset things. Also, there is a round sensor on the left pedal crank. I think this can be adjusted by turning. And of course, you always have to lock the battery onto the mount with your key. Just the slightest bumps in the road makes the battery jump up and down and become unconnected intermittently. I didn't realize until I read here that there was a connection between the brake and the motor. Makes sense.