I have always noticed that my best lather seems to come with that very first application of the lather when I have whiskers. Then as I shave, each pass, the lather seems to dry much faster. I haven't changed the lather in my bowl. My final pass, I cannot lather the entire face without it drying and I have to apply the lather in sections.

Is it drying out in the bowl over time or is this a common occurrence as the whiskers get shaven down?