Every so often (every few weeks of few months) when the start button is pressed, the motor starts for less than 1 second and then stops. The panel lights flash and PF shows on the display. If the Off button is pressed, the lights on the display go out. If the start button is pressed again, the same thing occurs. If I shut off the breaker for 30 seconds and leave the machine alone for a few minutes, it then starts and runs normally, perhaps 5-6 times a day for the few weeks or months until the next incident.