Loosing all data in customer machine

Hi,

I'm facing a very strange problem using Postgre.
I have Postgre v9.3.5 installed on a customer machine (WinXP SP3 2GB RAM).
This instance of Postgre has one database with 4 schemas (public +3), each
schema has several "simple" tables (table with primary key and a sequence).
Postgre was installed without any additional configuration except to allow
external IP's to connect.

It seems that randomly the database looses all data.
All the tables are present with the correct structure but the data simply
vanishes.
I don't think it is a bug in the software because each application only
works with a schema and the data is erased from all schemas.
Also, I don't think that it is the database's fault because I have one
instance of Postgre here at the office and the data was never lost.
No other connections are made to the database besides my software and
pgAdmin (usually to backup the data).

Can anyone give me some ideas and hints on were to look for problems?
I'm I doing something wrong?
I know this is probably not a very common problem so there must be
something obvious that I'm missing.

I don't know if this helps but my software is developed in Delphi XE5 using
FireDac to access the database.

Thanks in advance,

*Ricardo Oliveira*