I've always assumed that writer's block only referred to that time when you sit down at your computer and stare at the white page in front of you. You want to write. You just can't seem to get started.
But writer's block can also be that time when you have no motivation to write at all. When you feel that novel you want to write weighing on you. I read once that a project like a novel is so large that it takes your brain a while to accept that you're actually going to try it. Until it can accept that fact, it simply stares blankly at the screen, waiting for something to happen.
I recently went through a period of this. I think in some way it's a good thing. It clears your mind. Allows you to do other work that might distract you once you get the 'inspiration' you're looking for. I've noticed in my own writing there are times when I feel the NEED to write - when the story WANTS to be told and I have to work on that novel every day in order to get it out of my system and into the world. That's when I do my best writing. When I know where the story is going and how to get there. If I'm not in one of those 'phases' writing is a chore. It's dull and uninspired. It's boring - both to write and read. I've found it's best to wait out those 'dry' periods while my brain works itself around whatever issue with the story is causing problems and start writing when my brain clicks back into knowing what to do and how to do it.
In the mean time, there's lots of other things to keep me occupied.