I keep having a bug that makes me unable to play a game!

Put the emphasis on "a". Lemme explain:

Sometimes after starting a game , picking my champ and then saying glhf to my team (as everyone does) , i go in the pregame screen as expected , but it loads forever! After ~10mins i get a error message saying that i've been disconnected to the game. Then the game closes down (but not the client tho). When i try to go back into the game, it loads for ~10mins again and maybe i get the chance of coming back into the game (tell about chance when i'm getting flamed by my team and eventually reported when i come back*[slayer-pantheon-thumbs]* ). The worst part of this is that i keep having this bug for about a week and at first i thought it was my connection doing crap again. But i am sure now that it happens only after i booted up my computer , the next games are bug-less. Its really the first game after booting up my computer that has this bug.

I'm looking toward any ideas on how to solve it and have a good day!