Game Crashes In Black Screen

When searching for rankeds on my last promo I game crashed in a black screen and there was no other think i could do but close it and refresh, i lost one of my promo games for that and it isnt the first thing it happens. My internet conection was connected all time and didnt disconected in all the time, i have no antivirus that is know for giving problems to launcher. I dont want my game to not count as a defeat but just that this stops happening cause it isnt the firts time it happens and it is just unfair for me and the other players.
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