My book became boring! What would YOU do?

I'm reading Princes of Ireland by Edward Rutherfurd, supposedly the modern James Michener. Actually, I enjoyed the first 570-odd pages of the book. Suddenly, though, the story ground to an abrupt halt. It's become so boring my eyes blur and glaze over as I struggle to continue. I struggled through 50 pages and then decided to try skipping to the next section. It's not engaging my interest, though, and I keep putting it down. There's another 200 pages to go. What would you do if this happened to you?