Sudden huge increase in internet data usage

I have used about 200-300 gb per month in the past. Suddenly in March it jumped way up, and with 10 days to go in April I am already at 1.6 TB. I contacted Xfinity (why can't they use people you can understand?) and talked to 3 different people for over an hour and it solved nothing. That was 2 days ago when I was at 1.3 TB. Now I see I am being charged $80 for the overage. I am bout ready to leave Xfinity and go with another carrier. We have been a customer for 13 years. This is so MADDENING!!!

Something is definitely going on!! We went over by 400 GB last month, and we are on track to do the same this month. This is unusual for us. Not to mention, the connection is constantly laggy. Now I'm probably going to be charged late fees for mediocre service. There should be no lag considering I'm paying for gigabit. I can't wait until HBC is available in my area! I may have to look into an alternate provider for the time being.

Dealing with a very similar case at this very moment ... Saw a massive, massive increase in data usage over 20 days this month. Received all the warnings and watched the data usage increase exponentially over a matter of hours within a 24 hour period until I exceeded my data allotment of 1.2 TB (1229 GB). Not possible, simply not possible. 

According to the specialist I was forwarded to, "As I check the data usage details, your average data usage of last six months is below 600GB per month, which means you have not used half of your limited data. In limited data option, you are getting 1229 GB data per month and have used below 600GB in last 6 months" ... "However in current month you have used 1273GB data already." 

There are 10 days left in this month. 

There is absolutely zero question this is a scam designed to push people to purchase the unlimited plan.

While I was on the phone with an agent, I was offered a surprise special deal to add the unlimited plan to my account for $11 more per month. I already pay a small fortune for my internet access and I can't afford to get scammed again next month now that I've used my "grace" month. I accepted the plan, and I'm not happy about it.

According to the specialist, they can't access the data details per device due to privacy issues. It's all so very very very convenient. 

On April 16th I was sent a notification of using 90% of my 1.2TB Data Plan. I found this odd because the house averages around 600GB of internet usage for the whole month. From OCT 2021 and Each month after the data usage has gradually went up. The internet usage of the Family has not changed. I've looked at my past notifications an have never received a Data Usage alert. I have since removed myself off the Family network for internet, except for now. Only two or three Devices are are connected to the internet, but today only 6 days after receiving the notification, we have used 450GB over the 1.2TB. Come on something is going on.  Is the Data Packets becoming larger? I do believe this 1.2TB plan we've had for 10+ years. The data plan should match the average users monthly usage. After searching the community, I looks as if several Xfinitity members after been experiencing the Same Issue. Anyways, is there a tool available to assist in monitoring the traffic and data used from the modem? I know there has NOT been 1.2TB of data going across the router this month. I'll be extremely monitoring and capturing the internet traffic at the start of May. The Wife is not going to happy. ;)

For the past few months I have exceeded my data usage. I am wanting to understand specifically what devices on my network are consuming data each month. The standard online reports through the website are not useful because it only shows the total. I have reset my network password so I know I am not being hacked.

I recently signed up with a new plan on the 4K flex Box and a 600MB they're megabytes I just received my 1st notification that I am close to going over my data limit.  I was previously a customer with Comcast for over 20 years and had to take a break so I could find a new place to live and I never received any notifications regarding data usage please advise how I can get rid of this issue issue I have gotten a new gotten a new gateway modem them but that doesn't seem to be helping

hi, I see a sudden spike in the last 2 months on the overall monthly usage. There is no major change in the usage behavior or a new device. How can I check if any device is consuming the highest and plan the consumption accordingly. 

Any inputs to check this using xFi gateway ?

We are using data now in a week, like we used to use in a month. We’ve lost visibility to daily device usage and nothing has changed. No one is working from home. We have only 2 people in our home and usage is daily 25 min on a Apple MacBook Pro. I pint 4-5 mailing labels a day. Watch tv about 2 -3 hours a day on a Smart TV.

We don’t have streaming channels because we have cable through comcast. No way could we be using a TeraByte a month. Help us. We changed out the router. Logged every device off, got a new passport and signed back on. 

Your kidding.. perfect example I can't go thru the story i just typed AGAIN horrible I tried they dropped [Edited: "Language"] again Shame Shsme Shame

Solved the problem by going for T-Mobile's unlimited home internet and cancelling Xfinity. I hope the rest of you find a way to solve this on your end!

Hi everyone, I have also been having this problem and found the culprit, so wanted to comment in case it can help anyone else. Our data usage has consistently been between 300-500GB per month until two months ago when we suddenly jumped to 1200GB. This month, same thing. Comcast, unfortunately, was not a whole lot of help. Here's what you do if you're on Windows...

Open Settings > Network and Internet > Data Usage

This will show you a breakdown of what applications on the computer are using data over the past 30 days.

If this does not reveal anything, you can also try pinpointing which device is the culprit using your router's network monitoring (https://www.lifewire.com/how-to-monitor-network-traffic-4686032). Turn wifi off for every single device except the one connected to the router and wait for it to settle to a very low amount. Once it does, turn wifi back on for each device one by one, giving about 5-10 mins in between to watch to see if there's any spikes.

In our case, the issue turned out to be Outlook on my wife's work computer. Over the last 30 days it had used 474GB of data! She's on the phone with her company's IT department right now, lol. For comparison though, my work computer used 1.95GB of data for Outlook in the same time frame.

Good luck!

Hi everyone, I have also been having this problem and found the culprit, so wanted to comment in case it can help anyone else. Our data usage has consistently been between 300-500GB per month until two months ago when we suddenly jumped to 1200GB. This month, same thing. Comcast, unfortunately, was not a whole lot of help. Here's what you do if you're on Windows...

Open Settings > Network and Internet > Data Usage

This will show you a breakdown of what applications on the computer are using data over the past 30 days.

If this does not reveal anything, you can also try pinpointing which device is the culprit using your router's network monitoring (https://www.lifewire.com/how-to-monitor-network-traffic-4686032). Turn wifi off for every single device except the one connected to the router and wait for it to settle to a very low amount. Once it does, turn wifi back on for each device one by one, giving about 5-10 mins in between to watch to see if there's any spikes.

In our case, the issue turned out to be Outlook on my wife's work computer. Over the last 30 days it had used 474GB of data! She's on the phone with her company's IT department right now, lol. For comparison though, my work computer used 1.95GB of data for Outlook in the same time frame.

Good luck!

Hi Team,

   I am having same problem, I got an alert this month that I’m exceeding my 1229GB plan. I’ve historically used 500-700GB.

Month is not yet finished and data usage is showing as 1600GB. Called Customer Security Assurance and they suggested to change password and change modem. I did both, but still seeing the data usage is high.

I’m running into the same problem my usage has been averaging less than 600GB a month. Somehow this month it spiked over 1.2TB with a week to go. I tried calling comcast security and the person on the line sounded like he barely knew what he was doing. He gave a ticket number and said someone will call back but nobody has. I’m using the same (and my own)  modem and router for 5 years. Interestingly after the call the usage on the site now says we’ve used about 8GB per day. When I got the warnings i checked my  usage and somehow ive used 150GB in an hour. Nothing has changed no devices added or removed. Everyone has been doing the same thing. 
Interestingly I also can’t find the direct message link anymore.