Hello from Spain. I have the same error CP7. I was talking by voice chat with other players I kept on the lobby more than 10 minutes without problem but, at the moment in which the sesion starts and the game begin to charge the race track and cars (so just when the race is about to start), the voice chat started to lose intensity and I got a terrible lag. After that, I can play just a few seconds (over 20 seconds in wich lag becomes stronger and stronger) until I get disconnected. This happens each time I try to play online (any mode). I have tried several times and always happens the same things in the same order. That means that there is a huge loss of data that keeps increasing continously until I get discconected.
I have checked the connection speed (320MB), Wi-fi Signal of 100% intensity (my PS4 was closer than 50 cm to the router) and I also have checked the router ports. I can play online any other game (including F1 2017) with not a single issue no matter if I connect the console via Wi-fi or wired. I have also checked that I can play F1 2019 online just If I connect my PS4 via ethernet. If the console is connected via Wi-fi, I can play any game but not F1 2019.
I repeat: I can't play F1 2019 online via Wi-fi, but I can play any other game without problems. That means that my console, the router and everything is working perfectly except for the F1 2019 game.
So all of this things are making me being completely sure that the problem comes from game server's setup, which may demands an enormous quantity of data that the Wi-fi connections can't offer.
So, please, Messrs computer repair techinicians of Codemasters, I beg you to investigate about this problem because I'm sure that a lot of people (like me) bought F1 2019 for playing online and they can't do it because they can't use a wired connection.
At the end, I want to say that I am not blaming anyone and I am just telling all of this to give you my feedback and explaining exactly how and when this problem occurs because I think it may help you to solve this problem sooner.
Thank you in advance for your attention.