[Client] [Crash]

Got into a Ranked game and while loading in it gave a error message to "check internet connection and then to try reconnecting". I know for a fact is not our connection being that I'm playing at a high end internet cafe and everyone around me is playing just fine. Normally i wouldn't even complain but after trying everything and reconnecting several times, i finally get into the regular league home page to find out I've been demoted. Really not a great experience hope this can get fixed