I also had the September spike. I’ve never been over 500 gb, yet somehow while being out of town for a week and having my modem unplugged for another week I hit 1100 gb. Internet only, no tv. After a few calls to CSA, where they talked to me like I was a moron I might add, I finally got them to open a ticket. My router traffic says I’ve only had 407 gb worth of data volume yet nobody at Comcast seems to think that’s an issue. In fact, even after I unplugged my modem my data usage went up over 60 gb.
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