Problem with connection. How i can fix it ?

I don`t know how but i can`t join single game because after champ select i cannot load the game bcs i get problem with the connection that i can`t fix and don`t even know why i can`t join the game. I think it isn`t my internet problem because i can go champ select without any issues but when try to join game after it i get instantly alert and even restarting PC or game doesn`t work ;/. Waiting for help or smth from RIot {{sticker:slayer-jinx-wink}}
Report as:
Offensive Spam Harassment Incorrect Board