[Zope] Zope Sybase database connection keeps closing

My zope Sybase database connections keep closing for no apparent reason. When I try to reopen the connections they sometimes give me the following error: *Invalid connection string: *|database: , password: access, server: SYBTIGR, transactional: Y, user: access When I make a copy of the connection object that is giving this error, the original connection reopens automatically. This behavior seems really bizarre and is causing our Zope website to remain unavailable. Abhilasha