reach limited

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...

Hello guys I really need help. I put links on my pages but they get 0 reach and pics get normal reach. Is there any resolve for this problem? If yes please help me.

I have a main page I intend to raise, and I have 100 pages of 4-5k likes. But the problem is to reach. When I upload a video to the main page, and share that video on all other pages. But reach these pages 4-5k likes very small 1-5 people reach? What could be the problem here

My last ~4 posts have gone pretty viral and now I'm getting like 100 likes per post as opposed to 3k-5k for the viral posts. My main traffic source is engagement groups. Is this happening for everyone or do I need to change something that I'm doing