Suddenly DCed in ranked, client unresponsive, error login when restarting.

As the title said, I suddenly got disconnected around 3-4 minutes into a ranked solo game. Internet was perfectly fine. Was even checking in the net if the server was down. Client was unresponsive, after force closing it and starting it back up, only got login error message. Tried several times, same result. Only can log back in after restarting PC and force repatch with Hextech Repair Tool.

New client and game has been lagging with FPS drops since pre-season. So sooo bad. But I guess Riot has been busy making 5 different games and series instead of taking care of this game.