This happened to me at the end of February, which is why I'm a little behind now. In my case, my brain was restless - I was immersing myself in the creations of others, and the answer was to do my own creating. I worked on an ongoing music project for about a month, then I was able to go back to reading with no problem.
So, maybe it's possible that your subconscious is saying, "Hey, I wanna do something else for a while!" but you haven't discovered what it is yet. Or, maybe the book was good, but not engaging enough to keep you in it. That's happened to me, and I needed a "break" after before I could get into anything else.
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