i am creating web mobile application in mvc4. My problem is when I click on particular link in my application,it works well, but sometimes it automatically redirected to INDEX page that is set as default page in global.asax as

routes.MapRoute(
                "Default", // Route name
                "{controller}/{action}/{id}", // URL with parameters
                new { controller = "Home", action = "Index", id = UrlParameter.Optional         } // Parameter defaults
            );

Now I don't know why its automatically redirected to INDEX page,even if I have already defined controller and action name where it show redirected as,

<a href='@(Url.Action( "ActivityWall", "Home"))' > </a>

logically it should redirect to "ActivityWall" page,which it does.but sometime only it goes to INDEX page.then when I clear my cookie problem will again solved but after some time it again start redirecting to INDEX page.

I also posted question related to cookies issue yesterday,but I think that is nit main issue.

can someone help please ?