My site had a PageRank 3. Suddenly it was reset. What is the reason for this?
A drop in PR can be due to several reasons. First, they may be non-thematic links coming out of your website, and at the same time a weak or no increase in links leading to your website. Another cause may be neglect of the site, not updating it.
There is also another reason, namely, the web is constantly evolving. PR has a limit (10). Everyone wants to be as high as possible in the search results. It used to be enough to have 1000 Likes so that the PR oscillates around 10. Even now 1000000 does not guarantee high PR. Thus, after updating, the value of PR 2 can mean as much as before 3.
Conversely, if your site's PageRank has changed from any value to a value (-1), your website is not being considered by the PageRank algorithm. You should then check whether it has been banned.