After installing related-posts plugin, I noted that my page views started to soar in late February, but only when it was broken after an update, did the page views drop again. After I found the problem, fixed it, page views are way up again.
I just wish I could remember what I changed in Late February other than that! It’s a good idea to keep some records of the tweaks you make when you update your website. You’ll need to record the date you change and the nature of the change you made. Also, if your change is difficult, you may want to keep a copy of the old code that you changed! Just in case, you need to put it back!