My Account got "Banned" for 20 minutes.

I just logged in on my main Account in EUW and couldnt start any game mode or practice mode. They all had a little red icon and when i hovered over them with my mouse the text was "Your Account is banned." I was kinda confused since i didnt get a message or an Email and this account was never banned or even chat restricted. After playing a game on my smurf a logged in again and everything was back to normal.
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