Troubles connecting

[VW Golf MK6]

Hi, When i try to play with my friend we have troubles connecting with eachother. Sometimes when i try to connect to his game, i get an error saying can't connect to game and sometimes the same happens when he tries to connect to my game. We have checked we are on the same version of the game and we use the same mods. We both have a good (cabel) internet connection. For example we just have played and he could connect 2 times to my game without troubles but when he tried the tirth time he got the connection error. Any help would be apreciated, Thanks