I have been following a few forum strings about spikes in data usage. In July, for some unknown reason, I used twice as much data as my highest use month ever. And this was with only one person at home watching Netflix, no gaming, no large file transfers, etc. One of your helpful co-workers sent me a replacement modem / router which I will install tomorrow, but I find that to be a Hail Mary at best. I posted on our community FB page about this and literally dozens of people experienced the same spike.
What's up? For real!
Did you ever get a response to this. I am seeing the same thing. Been on phone with ComCast for over an hour and they just keep telling me to talk to my modem OEM. They will not provide a data usage break down to compare to what my modem is telling me I've used. My modem is telling me I've used much less than ComCast is saying I've used.
New modem, but I don't think that was the issue. I truly believe it was on Comcast's end and I'm trying to not be cynical about intentionality.
I did find, though, that it is important to know what quality your downloads are, and back them down. I believe changes were made by the content providers that jumped to the highest quality level which as we know increases data usage.
As odd as it sounds, there have been probably 6-10 cases that I remember reading where someone said that changing his modem made his high data use issue go away. I don't know what the underlying reason is, (could be coincidental) I just find it interesting. Yours might be the first case where changing the modem was Xfinity's idea.
I agree about the content providers. Screens keep getting bigger and I think some respond to complaints about picture quality by turning down the compression factors.