Internet problems...

So, I've been spiking terribly lately. One second I have 30 ping, the next I have 600, and it's pretty much unplayable. I live in Chicago with Comcast Internet. The spiking happens all throughout the day, besides for very late at night. Pubbed at 2AM, had 22 ping the entire time. No one is on my internet/wifi, no phones/laptops connected. Any clue as to what I can do to fix this?

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