strange lag ..!!

hi everyone . i have strange lag ..
my ping always 70
but in night arrive to 400 .... steel for 3 hour i dont know why ?>>
no wireless .. no downloading ...no updating

it's everyday from 3 weeks ago
my friends in same country 2 or 3 have same problem .. but the other no problem for them ... i am gonna crazy for that lag ...
pls if anyone have idea about that .. help me

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