Can positions drop from changing the order of blocks on the site?

Question

Search Engine Optimization

If you look at the DOM tree, it
was like this: seo-text, navigation
became like this: navigation, seo-text (the number of views increased from 2.2 to 2.9 per unique, plus the stay time increased, although not significantly)
But the positions sank, after 3- 4 days.

Answer 1

Positions can collapse due to elementary things - (change the location of categories in the menu, or pages)
Good corporations Google & Yandex are omnipotent and introduce a lot of shit code (calling it updates) into their algorithms, which, after comments and malicious statements of indignant webmasters and seo - shnikov, start fixing :)