Interrupted system call

I've been using Postgres 6.5.2 on RH6.1, with JDBC driver 6.5.2. Often (not
all the time) I get the following messages while executing my program and
I've been trying to figure out what the problem is and how to fix it.

An I/O error occured while reading from backend -
java.io.InterruptedIOException: Interrupted system call
at postgresql.PG_Stream.ReceiveChar(Compiled Code)
at postgresql.Connection.ExecSQL(Compiled Code)
at postgresql.jdbc2.Connection.commit(Compiled Code)
at DB.deleteService(Compiled Code)
at Impl.deleteService(Compiled Code)
at java.lang.reflect.Method.invoke(Native Method)
at sun.rmi.server.UnicastServerRef.dispatch(Compiled Code)
at sun.rmi.transport.Transport$1.run(Compiled Code)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Compiled Code)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(Compiled Code)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Compiled Code)
at java.lang.Thread.run(Compiled Code)

I've updated my Postgres server and JDBC to 7.0.2, but seems like the
problem still exists. Is this some bug or I'm missing something I need to do
in my program? Any suggestion will be very appreciated.

Thank you!