with what Karen said. You're plant is just shedding leaves, which is what all plants do every once in a while. Nothing to worry about, as long as your newest leaves don't start getting yellow. Just remember it's fine if old leaves get yellow, not fine if new ones do.
Now, I know you said "new leaves." Are you positive they're new, or just assuming based off their position in the plant? From the pictures, they all look like older leaves to me.
It's a beautiful plant!