Critical Error everytime i try to access at loading screen

Already lost 35 LP cos of this... I noticed the client is already buggy today...

I try to get into a game (today i played normally until now) All normal in champs select. Then in one game someone probably left at count 0, not actually leaving at the lobby but already in loading, so mmy client probably exploded. I try to get into the game but Lol closes itself everytime. I had no clue what to do...so i thought it was a client bug.

Then i try to play again, all good in champ select then before loading screen..

"critical error the system must be shut down" or something similar, i accept to make a report for the crash, then i'm back to client. I can do it endelessly, Team remakes again and i'm fucked... What can i do now? Meanwhile, i try to see if i can join training...