There was a dripping sound in the bathroom ceiling for more than 20 seconds

Do you mean--- the roof of your bathroom is dripping, the bathroom on the 4th floor is dripping, and the 3rd floor is dripping? This water is too powerful, it can drip to the 3rd floor, hehe, I don't feel like this, if the dripping water leaks, then you take a shower in the bathroom, it will rain downstairs, and the situation will be more detailed. Where is this bathroom dripping?

It should be the top sewer pipe, and a little water such as the upstairs toilet or floor drain slowly and directly leaks into the inside of the sewer pipe, and the dripping sound formed has nothing to do with your bathroom.

I've seen it at home, but I haven't found the reason yet. It is estimated that it is caused by poor sound insulation of downspouts.

For the sake of your own peace and tranquility, it is better to come by yourself, because it is difficult for you to determine whether it is the responsibility of the upstairs or the property, only discuss it with them, and when you open it to determine whose responsibility it is, it will be clear.

You take off the five main lights, and then you take off the shelves, and you can see with your head in it.