No, I would say that in recent memory it was just that book that was like that for me. Without spoiling anything I think it had to do with the book being kind of grounded (within the sci-fi setting it set) and then it just wasn't.

And yeah I could definitely understand losing interest in that way. You just kind of lose the connection to the book through lack of interaction with it. Not sure if it would work but it could help to go back a couple of chapters and start reading from there to kind of remember what you were reading and feeling earlier.