Turn on the toilet light, but the dormitory light is also on, and then turn off the dormitory light,

The light and the socket are generally two lines, and in your case, the protective device that controls the light has tripped.

Do you have a separate circuit in the bathroom? If it is set separately, then don't push the air switch in the control toilet at the moment, and then send the beam to roll and push the gate knife up again. If you don't open the light switch in the bathroom, it won't jump, then there is a problem with the wiring of the bathroom. Dust remnant.

Poor contact? You can try changing the light bulb or use an electric pen to see how charged the different holes of the socket are.

Do bath bombs and lights share the same switch? If so, I guess your switch is broken.

The switch bus is disconnected, and there is electricity in the lamp head, and the electrician may connect the live wire to the lamp head.