Site becomes unresponsive after 30 min Inactive.

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ASP.NET

session

Hello.

Am using Inproc session and i set session time out to 180 min.
When we wont interact with site for 30 min. then the site becomes unresponsive and we need to restart the browser to open the site. until we restart the browser we are unable to access site.

I dont know why this is happening. site is logging off before session time out...
i struggling to solve this issue. Please help me to solve this and refer me any article to know why this is happening.

following are the settings am using in web.config

<httpRuntime maxRequestLength="504800" executionTimeout="360"/>
    <sessionState timeout="180" mode="InProc" compressionEnabled="true" cookieless="UseCookies">
    </sessionState>
        <compilation debug="true" targetFramework="4.0">
            <assemblies>
                <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
      </assemblies>
   </compilation>
        <authentication mode="Forms">
        <forms timeout="180" name="ScoreStreetFormsAuth" loginUrl="Login.aspx" slidingExpiration="true" cookieless="UseCookies"/>
        </authentication>

Thanks in advance.
Naveen G