Why do the three lights turn light by themselves?

The wires inside are connected backwards.

If the three lights change color by themselves, it is likely that the wires inside are all connected backwards. At this time, you can turn off the main power switch at home, and then open the shell of the three lights to see if the live wire and the zero wire are connected wrong. Generally, our wires with different colors are connected to different solder joints, and there will be corresponding signs on the solder joints. If the connection is wrong, we can transfer it. If this line is not wrong, it is likely that the switch wires of the three lights are wrong. At this time, you can check the problem of opening bus lines again.