Visual Studio 2013 IntelliSense stops working for ASP.NET MVC5 Controllers

Question

I am facing a weird problem in my Visual Studio 2013 ASP.NET MVC 5 project. All of a sudden, the IntelliSense in the Controller classes of the MVC 5 project are not working

Answer 1

I found that the best way to fix IntelliSense issues is to simply unload the project in the solution explorer and load the project again. After that IntelliSense is always working for me and I do not loose bookmarks, breakpoints or any other settings.