When you work in SEO and depend on organic traffic you need to understand how a search engine works. You should always be looking for ways to improve your organic traffic.
Google Penguin was built to fight web spam. Now it’s part of Google’s Core Algorithm and it works in real time. But just because it's not on a daily news, doesn't mean it's not very active inside Google.
If your backlink profile has a high DTOXRISK, your website could drop in rankings. Since Google Penguin 4 this can now affect a single page or directory on your website.