Sudden huge increase in internet data usage

@Pgar08​ Nobody has had successful resolution UNTIL they upgraded to their unlimited plan.  Then POOF!  Suddenly data usage drops right back down to the super low usage they always had.

@user_993538

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I don't know what my Netgear 3rd party gateway traffic meter counts, but it's not data, nor is it accurate for a fixed known size upload/download if I watch it in real time.  You can try that yourself.  Download a large .iso without a download manager or compression and watch it.  As of today for the month:

Netgear says: 2773.54 total traffic for May (2.7085 GByte).

Xfinity says: 56Gb for May -- but there's a reporting lag there and I don't know when the cutoff time is for a 'day'.

At the physical interface level on my firewall, and all traffic goes through there including WiFi, I've passed or absorbed 60.32 GByte to the Netgear.  There are no errors if you get down into the mud on the TCP stack, so I would guess most if not all made it to the Netgear.  I can't see internally into the Netgear, so I don't know how many retransmits there were, but I'd guess most of it made it through or came through from the internet.

Over time, Xfinity always reports a bit short of what I know I actually pulled or pushed, but I'm assuming it's rounding and doing it daily.  We'll be off around 35-55Gb by the end of the month typically. 

I get daily reports from the firewall.  If I'm using over 40Gb/day (1.2T/month), I know something is off on the network, and can see which device did it, when, plus what is going on in real time.

I consider it essential if you want to avoid a data cap.  Some devices I throttle intentionally to avoid it.

HI @user_993538. Please contact our wonderful CSA (Customer Security Assurance) if you would like more detail information about your data usage. 

Here is their contact information;

• Business Hours: 8:00am - 12:00am EST, 7 days a week
• Contact: 1-888-565-4329

Hello there @user_1287a6!  Thanks so much for taking the time to reach out to Xfintiy Support with Digital Care here on our Community Forum.  We are so glad to hear from you and more than happy to address your concerns with your data usage.  o worries!  You have reached out to the right team, and we are going to get this taken care of for you in the best way that we can.  So that we can get started, please feel free to shoot us a private message with your full name and complete service address.  That way we can access your account to get a good look at your usage.  

To send a "direct message" / "private message" message to Xfinity Support:

 • Click "Sign In" if necessary

 • Click the "Direct Message" icon or https://comca.st/3Nc3iME 

 • Click the "New message" (pencil and paper) icon

 • The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there

 •  - As you are typing a drop-down list appears. Select "Xfinity Support" from that list

 •  - An "Xfinity Support" graphic replaces the "To:" line

 • Type your message in the text area near the bottom of the window

 • Press Enter to send it

@user_0256cd Hello and thank you for reaching out over our Xfinity Community Forum. I would be more than happy to take a closer look, and help you get to the bottom of this higher than expected data usage, no problem at all! Whatever we can do to help a valued member of our Xfinity family. To continue, could you please send our team a direct message with your full name and full address? Our team can most definitely take a further look at this issue.

To send a "Peer to peer" ("Private") message:
Click "Sign In" if necessary
• Click the "Peer to peer chat" icon
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line
• Type your message in the text area near the bottom of the window
• Press Enter to send it

@user_6c6fa9. Due to privacy we are limited on specifics on data. The best we can do is give you tips on where to look on your devices and computers. If you have already done that and don't see any high usage I recommend calling our Customer Security Assurance who handle data disputes. Call 1-800-Xfinity and say that into the automated system.