Script Manager timeout?

I am getting the error below and it only seems to happen if the page is dormant for a while.  The ScriptManager control is in the master page.  Is there a setting to avoid this error?

The control with ID 'UpdatePanel1' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.

 Stack Trace:
   at System.Web.UI.UpdatePanel.get_ScriptManager()
   at System.Web.UI.UpdatePanel.RegisterPanel()
   at System.Web.UI.UpdatePanel.OnInit(EventArgs e)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)