"You have disconnected, please check your internet connection and try again."

I'm new to League of Legends, sorry to bother you. I wanted to report a bug that is happening to me from the morning. Yesterday i was playing alright, no lagg and some small screen freezes but they weren't a problem but today, in morning i tried to play and while i picked my champion, and the game was loading, it stopped at 98%,then i waited for a few minutes and i noticed my screen freezed and when i was clicking on the screen , my mouse cursor making noise everytime i click,i opened task manager and removed league of legends and i saw message "You have disconnected, please check your internet connection and try again." , i checked my internet connection and it was alright. If there's a chance i would get a reply it would be awesome, maybe other players are having this same problem as me. If someone could send me a link of a video to fix this i would be greatful. Thanks