For no apparent reason, the number of application installations has plummeted, what could be the reason?

Question

Classmates

Since June 20, the number of installations of our application "Quarantine" has fallen by about 5 times ok.ru/game/quarantine
The game has been in the catalog for about a year, all this time there has been stable organic traffic, an average of 300-700 installs depending on the month. There are no visible reasons for such a sharp drop, there was no update in those days, the avatar did not change, the game is still in the Strategy section in the catalog. Perhaps someone can suggest what happened?