ViewExpiredException richfaces

pessoal quando fico um tempo com a tela parada na aplicação cerca de minutos quando vou executar qualquer ação da o seguinte erro javax.faces.application.ViewExpiredException: viewId:/main.dg - View /main.dg could not be restored.

xml

<welcome-file-list>
        <welcome-file>start.jsp</welcome-file>
    </welcome-file-list>

    <context-param>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>server</param-value>
    </context-param>
    <context-param>
        <param-name>org.richfaces.SKIN</param-name>
        <param-value>blueSky</param-value>
    </context-param>
    <context-param>
        <param-name>org.richfaces.CONTROL_SKINNING</param-name>
        <param-value>enable</param-value>
    </context-param>

    <!--Soluciona o problema da ViewExpiredException ACHEI NA INTERNET MAS NÃO ADIANTA-->
    <context-param>
        <param-name>com.sun.faces.disableVersionTracking</param-name>
        <param-value>true</param-value>
    </context-param>

    <!--Somente aplicado se o estado saving method seja "server" (= default).
            Define o tamnaho (default = 20) das ultimas views serao armazenadas na session.-->
    <context-param>
        <param-name>org.apache.myfaces.NUMBER_OF_VIEWS_IN_SESSION</param-name>
        <param-value>40</param-value>        
    </context-param>

    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.dg</url-pattern>
    </servlet-mapping>
    <listener>
        <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
    </listener>

    <filter>
        <display-name>RichFaces Filter</display-name>
        <filter-name>richfaces</filter-name>
        <filter-class>org.ajax4jsf.Filter</filter-class>
    </filter>    
    <filter-mapping>
        <filter-name>richfaces</filter-name>
        <servlet-name>Faces Servlet</servlet-name>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
        <dispatcher>INCLUDE</dispatcher>
    </filter-mapping>

faces

<lifecycle>
        <phase-listener>br.com.projeto.filter.AuthorizationListener</phase-listener>
    </lifecycle>

...

beans e navegações ...
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...
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classe de ciclo de vida

public class AuthorizationListener implements PhaseListener {

    public void afterPhase(PhaseEvent event) {
        FacesContext facesContext = event.getFacesContext();
        String currentPage = facesContext.getViewRoot().getViewId();

        boolean isLoginPage = (currentPage.lastIndexOf("login.jsp") > -1);
        HttpSession session = (HttpSession) facesContext.getExternalContext().getSession(true);
        String currentUser = (String) session.getAttribute("codUsuario");

        if (!isLoginPage && (currentUser == null || currentUser.equals(""))) {
            NavigationHandler nh = facesContext.getApplication().getNavigationHandler();
            nh.handleNavigation(facesContext, null, "loginPage");
        } else if (isLoginPage && (currentUser != null && !currentUser.equals(""))) {
            NavigationHandler nh = facesContext.getApplication().getNavigationHandler();
            nh.handleNavigation(facesContext, null, "openSystem");
        }
    }

    public void beforePhase(PhaseEvent event) {
    }

    public PhaseId getPhaseId() {
        return PhaseId.RESTORE_VIEW;
    }
}

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