Yeasion folding bike. Stopped long enough that display shut off. Went to ride and would only go on pedal assist. When turned off and back on later the brake emblem and err2 shows on display. Unit now will do nothing. All settings are correct. Turn display on running light glows, turn light button on and brake light comes on . My other bike the lights won't come on till till switch in engaged. Perplexed.