What happens with google?

Absolutely lost site from the search
Why the site ****** dropped out of the Top? According to key queries, it is not at all.
The site has plummeted in issuance
What happened to google? Site dropped out
The site dropped out of the search results!
The issuance of the site in the search engine has fallen sharply.
Is there no Google search engine statistics at all and there is not a single visit to the website from the Google system?
The site fell out on all positions from Google, but in the toolbar it shows that all is well

This is what appeared yesterday-today on Google’s webmaster forum .

In short, the problem is the same for everyone: the site simply disappears from the search results without explanation (personally, yesterday my number of clicks from Google decreased from 70-80 per day to 10, today there is not a single one; I checked for queries that went for several days back - then on these requests the site was on page 1-2, now not on the first ten). It looks like a ban or a filter, but, first, in the toolbar it says that everything is fine and the pages are included in the index, and secondly, how can this not happen so drastically with several absolutely different sites?

Since there is no normal support for the best search engine in the world, and it seems there is no reason to expect answers, I would like to ask the community if someone has similar problems? Who sees the possible causes of this, and what are the ways to solve the problem?