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There should be a problem with the water pipe.
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Do you boil water mean open shower water?
The floor of your bathroom is not waterproofed, or the waterproof layer is not qualified.
Then it is your own building, or the house next door is leaking, it is recommended to find a plumber to check it, and the property generally has a telephone.
It depends on the location and size of the leakage, or the floor heating pipe leaks, or the embedded water pipe joint is not good leakage, or the water on the ground upstairs flows down the close, or the sewer pipe leaks, which should be described in detail by the landlord or carefully investigated, and then solve the problem.
This is a matter of personal habits, you can stick it inside the bathroom door, remind you to remember to close the door when you come out of it, not only for him, but also for a person who is not particular, or remind him to let him slowly change his habits.
It may be that the pipe joints of the pipe well are not properly connected. It may also be on the 10th floor or above. It's not your family's problem. This should be inspected by professionals on the spot.