Sudden Spike in Data Usage

So after calling and monitoring and logging on a spread sheet, my data almost every hour, our average daily was less than 5 gb, for several days.

My billing just rolled over and went from 0 GB to 13 GB in 1 hour, then 13 to 17 gb in the next hr, and we have nothing connected!.

Just not sure what to do, we are using Xfinity wi fi hot spots for all our devices and it still goes up at a unrealistic rate.

I'm having this exact issue, and it is infuriating. Xfinity sends me a link to a data usage monitoring page that doesn't work. The Xfinity Assistant and the 800 number won't provide any information. The latter just wants to reset my modem over and over. I know for sure that this month I have used less data than usual. My video calls are way down and I haven't downloaded any new video games. And yet Xfinity tells me I've blown past my data cap for the first time ever.

I am having the same issue. When I spoke to someone over the phone he claimed it may be a "virus" and then just tried to upsell me on unlimited Data. For years we have only used around 600GB and now this month we've used more than double our typical month. We went to the Xfinity store in town and they said they don't have answers or technicians to look into it. He didn't try to upsell us either, but said that may be our best solution. The only change we had last month was switching back to our own router, which had been using years prior before our move to this home where we had the Xfinity router for several months because I had just never put ours back. There should be zero difference. Our habits have not changed. And the day we got notification of going up to 75%, 4 HOURS later we were notified it was at 90%. The person on the phone said that was not possible, yet still tried to upsell us. Absolutely frustrating!

I do Have the same problem as i've notice that before or even last year i haven't had a problem of going over my data usage but now for the last 2 - 3 months i'm going over my data usage, funny thing is pandemic time when all of the kids using xoom meeting with my 3 kids it never goes over the 1.2 TR, but now it seems that almost every month it goes over. I've lower video resolution from 1080p to 720p and advice the device users on the house to do same thing and still my data goes over. It seems like for some reason its devouring all of the data before the months end. 

They are the worst. Their site is slow and doesn't work half the time. It can take 40 seconds to get to the page you clicked on. User experience is like a 1995 website, cumbersome and unpredictable. It's not a 21st century website. But hey, gotta keep those $billions and $millions in those executives' pockets, right? Upgrading is too expensive. Yes, many customers are experiencing data being inflated. Same for us. Makes no sense. From reading all the forums and googling the topic, you can see it reads like they hit a batch of customers up for a few months and then move on to hitting up another batch of customers for inflated data. All the while hoping that no one will call or write to complain. But hey, there's not much the customer can do about it. Data usage isn't transparent for most of us because we don't use their router. Even still, do you trust a decrepit system like theirs to be accurate? Or my bet is that they are rigging the numbers. Don't even think about calling. Trying to get an honest answer is just begging for an upsell. So, it's time to shop around.