I had a connection failure during the ranked session, I tried to reconnect several times but I couldn't. I'm getting this problem so often and my internet connection is stable and good. The reason I disconnected from the game is always my fault because I'm accidently touching my ethernet cable on my laptop.
I can not reconnect when I'm getting a connection problem and it costs me renown and mmr penalty, 1 hour of game ban and losing a match.