Game Freezes at 6 minutes every game .

For the past 2 patches I've been having this weird problem when playing in which at 6 minutes in-game time League will start freezing every 5 secs for 1 minute or more then the freeze stops completely for the rest of the game. The problem is that it occurs in every single game , in the same time . I've tried reinstalling , flushing dns , using ccleaner for registry but the problems persists. Has anyone had the same problem before? Is there any fix or should I just wait for the next patch hoping to fix itself.
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