"The player has left the session." message everytime


Hi guys, I just bought USF4 from the Steam sale a couple of days ago.
Im getting this message after ı try to play online matches : "The player has left the session."
The game holds for awhile then the message pops.
Its been like this the whole time now, didnt even finish a single game.

I have a good connection too and the games run smoothly while it lasts.

any idea what might be causing it and do you have a solution? Itried disabling both my own and my routers firewall, verfiying my game cache and reducing maximum ping ingame.