Really strange connection issue

Ok, so the problem is this : EVERY game, in the period between 12 and 14 minute mark, I`m getting unplayable 1000+ ping for the next 1 minute or 2. I tried to check my conn every time and it was all good, I checked it on the support page with their internet speed test it was all good, it is happening every game and every time between 12 and 14 minute mark for about 1 minute or 2. I know it`s not a big issue but , sometimes, those 2 minutes could be really deciding and could give my opponents some huge advantage. I didn`t have this issue before the lastest patch, anyone could help me about this problem ?
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