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Resonance, avoiding the size of the resonance.
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The pipes are clogged or the pipes are bottlenecked!
You have to determine where the leak is, the main pipe, or what? But no matter where you have to find the property first, it's too troublesome to run by yourself, let the property get it. Fix it first and then find responsibility.
You can pass, blow the wind, pour water, sound waves. Identification is done from top to bottom.
You can go online and buy a bottle of carburetor and pour it down!
Is it that there is no ventilation pipe when the pipe reaches the top floor, or the ventilation pipe is not working? Go to the top floor to see by yourself, or find a property to deal with, or it may be that your own floor drain is not tightly sealed.
Generally, the leakage of the toilet is that the seventh floor affects the sixth floor, and the sixth floor affects the fifth floor.