Disconnected from game, Launcher crashes, takes me 10 minutes to try to get into the game again.

I have no fucking idea why this happened to me, i would not care if it was normal games. But it was my rank games, it fucking DC me first around minute 1, kicked me out off the game. then i saw the launcher saying "Game still in progress" and then it crashed

After I tried to open the launcher again, it just said this: https://cdn.discordapp.com/attachments/662046327995236394/665462540792233995/unknown.png

I went to youtube and forums to try to know what was going on, while i tried to open it. It ramdomly accepts me to the launcher again. I reconnect and the game was already at minute 10

Of course, it marked me as Leave, but like, why xD. I'm so fucking tilted how unfair and really bad client this is. It's just crazy. Every game i own has a decent and good performance launcher. Even minecraft has a better launcher. This really turns me off on continuing to play rank games or even league.