[Zope] Problem with Z Psycopg

I'm having a problem with Z Psycopg. From time to time (quite often) it looses the connection with the database and I get: Site Error An error was encountered while publishing this resource. Error Type: OperationalError Error Value: no connection to the server Then I have to login then close and open the connection. It then works for a while before bailing again. Does anyone know what would be causing this? Zope Version (Zope 2.7.3-0, python 2.3.4, linux2) Python Version 2.3.4 (#1, Oct 13 2004, 21:44:19) [GCC 2.95.4 20011002 (Debian prerelease)] And ZPsycopg is version 1.11 Thanks, Jason.