[Zope] SybaseDAv2

Hello, We are using the Zope - Sybase DA (SybaseDAv2) to interface multiple application servers to a Sybase 11.9.2 backend server. Both are running Redhat 6.2. Periodically, the database connection is being lost on one or more of the application servers. When this happens, the DA database connection cannot be re-established until zope is restarted. Any requests made give the error '<method> is not connected to a database'. Access is no problem with the isql client from the same machine. It seems to me that the DA is getting into a state where it is blocking db requests for some reason. Has anyone else seen this type of behavior? Is there a fix or workaround? Thanks in advance, Mike Thompson Hilgraeve Inc.