Hi

We've just moved into a new flat that has been unoccupied for the past
4 months.

On day one we used the loo and the sink, and our downstairs neighbour
has told us there's water coming through his ceiling. It did stop
though, and there weren't any problems until day 4 when we used the
shower for the first time - again the leaking.

The neighbour has been there for years, this hasn't happened before.
What could have happened in the intervening 4 months? Could a pipe
have dried out and cracked?

Is there any sensible way of sorting it out before we take up the
floor?