Crystal reports closing database connection prematurely

We are using the java runtime to execute some crystal reports. We are using the ReportClientDocument class along with the ReportViewerBean.

When we run the report and leave the viewer open, the database connection ends up closing after some period of time and then if the user attempts to page further through the report, it errors out because the connection is now closed.

Is there some kind of timeout if and if so, can it be extended?

Thanks