PBE Unable to connect to the server

I've been playing PBE the past few days, have had no issue what so ever. ​This morning ,all of a sudden, I am getting an error message after the Champion selection( had no problem before then) while trying to connect to the server, black screened. I suspect at the postgame leaderboard, an enemy team also had a DC'ed player, I suppose every game the system pick one random player on each team and block them from connecting to the server. please fix this. Thank you.
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