I think I just get bored with the story at that point. Maybe if I could force myself to churn out the first draft in a month or less while my enthusiasm is running high, it wouldn't happen. I dunno--I've never written one so quickly. With my last book, The Wrong Kind of Man, I found starting a new book when I hit the wall with Man helped. I would work on Man one day and the next I'd work on the new book, which was Bad Girls, the second in my Eden series. I intended to do that every time, but instead I've been focusing only on Bad Girls and, bam, that wall jumped right up at the usual place!
I've been stuck there for the past couple of weeks, plodding along scene by scene, but I think I'm finally coasting past it. I don't plan out my entire book in advance. Instead, I know the general story and how it ends, but I only plan a chapter or two in advance. Yesterday I wrote a short scene before planning another chapter, and lo and behold, I ended up planning several! I always knew what my ending was going to be, but getting there wasn't so clear. Now it is. I think I just might make my self-imposed spring publishing deadline after all! And the wall--I'm starting to see it in the rearview mirror!