What is the reason for the flashing lights?

1, the wiring is wrong, that is to say, the zero line and the live line are wrong, so the circuit is reconnected. 2. The voltage of household appliances is too high, which leads to voltage instability. 3. Poor contact between power supply and lamps and lanterns, and poor current will lead to lamp flashing. 4. If the neutral current is too large, the neutral line will be charged, and then the light will flash.