I have an issue with Facebook for over 3 months. We use IA respecting all Facebook rules and we work on 20 different pages. 3 of them are facing a problem of reduced reach. After I post an article the reach is reduced and it lasts for about a week, after 7 days the reach is returned on it’s normal level but shortly after that the same problem repeats. Does anyone know why is this happening?
This might not be the case, but have you might ran ads to boost some of the posts, and then stopped using them? Facebook are known to do this with Instagram ads, so the same might apply here as well