Can't connect to the game after champ select

Since Thursday, I'm just unable to connect to any game.

I login without any problem, select the type of game I want to play, select the champion and runes, but after that, I don't get to the load screen... All I get is a black screen, and then it goes back to the "reconnect" screen. If I try to reconnect, the same thing happens again and again, in a eternal loop.

I think I already tried everything I saw on this forum and on YouTube to solve the problem, but nothing worked for me. Please help us out... We just wanna play the game and have a good time.