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'm not sure why it occurs, but when it happens to me I can recover Intellisense by simply restarting Visual Studio.

You're right, it's really annoying.