Loading screen stuck on 0%, got a 20 minute penalty cause of that

I can select my champion and everything, but when the loading screen comes up, it gets stuck at 0% for everyone. Its not my internet cause everything works fine. This is the 2nd time it happened, I was playing last night and this happened as well. Because of this, I got a 20 minute penalty when its not my fault and its the client's fault. Great. How do I fix this glitch?
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