Though I doubt it's the cause, give malwarebytes a try for scan, the others don't do the greatest job at malware scan.
The odd part with your usage is how sporadic it is. Fine for a number of days, then the big spike.
I am almost leaning towards the possibility of some of the reports of MAC cloning. People using a modem with a faked MAC address of another user, so the usage appears on the others account.
One thing to do just to eliminate that would be to go in and swap your modem
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Re: Very Unusual High Internet Usage Recorded - Customer's Fault?
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