Playstation 4 (COD WW2) despite port release no connection?

Co
- in PlayStation
2

I have the following problem:
I get with the PS4 in the game COD WW2 no multiplayer connection. I get permanently error messages, disconnections, etc.
It is the Fritzbox 7530 available, the Playstation is connected via LAN.
NAT is TYPE 2.
What surprised me is that sometimes I get a connection after several attempts, but then breaks off again.
Maybe someone knows here advice

Th

Do you have Playstation Plus?

Co

Yes of course