Extreme lag?

So today I tried to play a normal draft and the first 5 minutes I had no lag, then it started lagging extremely (300 400ms) and "attempting to reconnect" so I logged out and tried to reconnect but either LoL wouldn´t open or the log in would be stuck in "Authentitacing" or there would be a black screen after hiting "Reconnect" so I just gave up. If it helps, my brother was out for 2 weeks and I had no lag then the first day he came (today) this happened.
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