[CRASH]

I was playing a game and right after champ select I go into the loading screen. Things are all fine and dandy. But like 30 sec. in to the loading while the screen is still black and the rift picture isn't there yet, I get a message screen saying "Unable to Connect to the Server. Please Check your network connection and attempt to reconnect to your game." I know this isn't true since my sister and I play on the same internet and she played a game. I've been having this problem since two days ago and there really aren't any screen shots. Champ Select- dark screen- error message- client says the game crashed plz try to reconnect. I've deleted and reinstalled but that didn't work.