Having the same problem It showed up for the first time in Sept. 2019 where my data usage showed at about 3X what it's been since I've been on the current plan, probably going back about 9 months or so.
I may have slighlty increased my viewing of some youtube videos on my smart tv. but not that much.
After reading thise other posts, it looks like something is wrong on Comcast's end.
In my case there is no chance of wifi hacking as both my computer and smart tv are connected via ethernet and in fact. the button on the back of my modem for wifi, is turned off.
I can't tell exactly when it started , but it first showed up in Sept, and just on Oct 1, my data usage is showing at 84 GB. This can't be correct but since I own my own modem, Camcast says they can't isolate what device is causing this.
My tv, computer and voip phone are all working okay, and I thought maybe it was on my end, but now, I'm thinking this is all an issue with Comcast and it needs to be fixed.
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My data usage for Sept. just about tripled from the prev 9 months. Can't understand why as I did only slightly increase data by viewing some youtube videos on my smart tv connected via ethernet.
My computer is also connected via ethernet so outside hacking of wifi isn't the issue since I'm not connected at all via wifi. In fact, I have my own Motorola modem, and the button on the back to turn wifi on and off, is always set to off except for the rare occasion that I connect my smart phone on wifi. I can test it so it is turned off just about always.
This seemed to coinside with the speed increase from 150 to 200 mb download but I can't be sure if that's the cause.
Has anyone else had this issue?
Already today, Oct. 1, 2019,, I'm at 84 GB with only a short glance of a youtube video and my computer and tv are turned off during the day till after work late at night.
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