Random Disconnects?

So, for the past week about, I haven't been able to play a full game of league. At about 15 minutes in, every single game, I randomly disconnect, and when I reconnect, I'll be able to play for about another minute then I will be forced to dc again for some reason. Anyone have any similar problems or solutions? I currently have ATT Internet (Sadly all they have in my current area). And every other game works fine. It's just league that is doing this to me.
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