I had this experience several times in math classes, but I ascribe it to the professor not telling us where the lesson was going in advance. It was impossible t

I had this experience several times in math classes, but I ascribe it to the professor not telling us where the lesson was going in advance. It was impossible to know if a given example or proof was going to be a quick thing or a major operation that consumed the entire lecture. That uncertainty made it very difficult to structure my notes. I generally didn't have that problem in my economics classes, nor do I seem to have it in work meetings.