Yes, it happens. Sometimes, I intentionally stop writing after a 1/3 or half way through a post, just to go do something else and come back to it later with a fresh perspective or different angle at viewing the topic at hand. I think this can be a good thing in certain cases, especially if the "writing atmosphere" feels stiff or stagnant. But I also try to not make it a habit lol, otherwise, I might mess with the flow on days that a favourable for writing on one sitting.