Have you checked to be sure there are no issues with your Ezoic placeholders?
Also. you might want to go into Big Data Analytics in your dashboard and check that traffic for your highest earning posts/articles hasn't dropped. Overall traffic may be increasing, but if you have a lot of posts/articles, it's probably true that a few of them earn more than the others (higher EPMV)
This happened to me recently. My highest earning article - the one with by far the highest EPMV - moved from the number 1 position to number 3 or 4. Because traffic to that article decreased, my overall income decreased a bit.