WASD view not working

I am talking about the scene view movement using the WASD to get around the view. This works only part of the time and then stops working. When I can get it to actually move, it stops after a little bit. Anyone know why this is happening?

"The Flythrough mode lets you navigate the Scene View by flying around in first person similar to how you would navigate in many games.

  • Click and hold the right mouse button.
  • Now you can move the view around using the mouse and use the WASD keys"

In my case, while working on a 3D project, I selected the 2D button on the scene, and then WASD was not responding anymore. Just disabling 2D view was enough to allow WASD to work again.