Help

Good afternoon, can anyone help me? I downloaded the game to 5 days my pc runs with 90 fps, but to have a problem, sometimes the game hangs and only comes back when I leave and return to the game, like a paralysis, what can it be? , Conf: i5, 6gb ram, video 1gb, real source 500w, hd 500 .. windowns 7 ultimate
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