I noticed that I was unconsciously tried to end as many pages as I could into "cliffhangers" of various caliber, trying to peep reader's interest for them to return next week in order to see what happen next. Questions, unfinished actions, showing character's reaction to something we don't see yet, that sort of thing. The only other times I don't do that, I tend to make a page end into an end to an overall scene.
Have you been paying any attention to your page structure, or it just flows as it goes?