Why did the application disappear from the list in the Google Play category?

Question

Android

Hello!
I have an application in Google Play, located in a certain category. In this section, it was located at about 80th place, one day it simply disappeared from this list (not in the first 500).
The application itself has not been removed from the play, people download by finding the name in the search.
Very suspicious and not pleasant, I would like to understand the reason. Where to dig?
PS average rating 4.3, about 2000 reviews, 50k+ downloads.
Thanks in advance.