High ping only on some matches

Every time i jump into a game i have about a 50-50 chance of having a crystal clear 17 ping, or an unplayable 300. a quick look at http://www.speedtest.net/ shows its not on my end and i can play any other online game just fine. If i make a custom game and jump in with just me the problem is almost always worse and alot of times i will hold a steady 600-800 ping. I will buy a skin for someone if they manage to fix this for me. thank you
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