fb block new accounts after post?

Hey, maybe some of you have already had this problem.

Well, I have old accounts and after adding posts nothing happens on them.

However, after adding 3-5 posts to groups on my 2-3 weekly accounts (i warmed it), I get a blockade right away, not even a verification pops up.

I should get a spam warning or posting block first, but not block the account right away, right?

The question is whether the reason is
- account age?
- multi-account?
- proxy?

I think it is just that Facebook Algorithm is suspending/blocking accounts that are posting same link in 2-3 groups. I have had my id suspended twice and I only posted the same link in three groups with no abnormal activity. It has been really irritating to see.

P.s. I am an active member in those groups.

I don't posting links.
My post have only text like "I am looking for people to work. Talk to me."

Maybe it looks spammy. Or Fb tries to save people from scammers.
P.S.: I do not mean that you are a scammer