solve:

1.The controller has an external start stop signal. If the slow start time is too long, the vibration disk will stop flashing after normal operation. If the slow start time is shortened to the P value, it will not flash.

2.Test first to eliminate external electromagnetic interference (if it can work normally by conducting a wire from the GND port of the controller to the vibration disk). If it can work normally, then it is determined to be electromagnetic interference, and follow the steps to eliminate electromagnetic interference.