Unexplained Data Usage Spikes since August 2025

Hello everyone,

I want to report sudden, random jumps in household data usage that began in August 2025, as many others have also noted. 

I have thoroughly researched this issue, including checking my account information, device names, and device usage. However, the only way to determine device usage is by a tedious process of elimination—removing devices from the network one by one for 24 hours each to see if any patterns emerge. This method is not only time-consuming, potentially taking weeks, but if I do narrow it down to a specific device, what am I supposed to do then? Not use that device? That seems unreasonable and unacceptable. Moreover, I am not entirely convinced that one or more devices are actually the culprits. What are the chances that multiple customers have received this explanation and, upon further troubleshooting, not only weren't able to link the surge to a device but also found and reported a vast discrepancy in the usage data recorded by their modem versus the usage data recorded on Xfinity's end within their account? And what are the chances that various unrelated customers have reported the same experience around the exact times? It is SKETCH. 

This guidance appears to be a vague and lazy way for Xfinity to deflect blame while having a legitimate reason for not being able to prove this theory, claiming "their hands are tied" due to regulations. I'm not suggesting they ignore rules intended to limit device activity monitoring; I want to highlight how this guidance may serve as a loophole for Xfinity to avoid taking responsibility to investigate further or admitting that the surge in usage is due to a change on their end. It feels dishonest, unethical, and icky. 

Ironically, Xfinity encourages users to look for patterns, because while researching this issue, I have found some interesting trends: this anomaly is widespread, and customers seem to be gaslit by Xfinity, as if their IT support teams have not been fielding numerous angry customer calls and support requests regarding this problem over the past few years. Most sources indicate that after frustrating and unhelpful discussions with various employees, the only recommendation Xfinity provides to "resolve" this sudden, unexplained change in data use is to upgrade to an unlimited data plan. This is absurd.

Below, you'll find links to several forums discussing this same issue, as well as personal screenshots from my Xfinity app, where I, like many other customers, have experienced sudden and unexplained jumps in data usage. This is particularly perplexing given that for four years as an Xfinity customer, my data usage never exceeded the 1.2 TB cap.

• https://www.reddit.com/r/Comcast_Xfinity/comments/1g5vnhx/sudden_spikes_in_data_usage_is_this_a_scam/
• https://www.reddit.com/r/Comcast_Xfinity/comments/1k6fjg2/sudden_data_usage_spike/
• https://www.reddit.com/r/Comcast_Xfinity/comments/1mvhd6e/xfinity_sudden_increasespike_in_internet_data/
• https://www.reddit.com/r/Comcast_Xfinity/comments/1bhip7q/massive_sudden_data_usage_increase/
• https://forums.xfinity.com/conversations/your-home-network/sudden-increase-in-data-usage-in-july-and-august-no-change-to-streaming-habits-customer-service-cannot-provide-details/68aa3357c2fcab0161d0f8f1
• https://forums.xfinity.com/conversations/your-home-network/internet-data-usage-history-what-is-causing-my-data-usage-to-increase-month-to-month/67eae7e3b52de854d43ba5b0
• https://forums.xfinity.com/conversations/your-home-network/xfinity-data-usage-suddenly-increased-edit/6847751f0959f81f1d0cee05
• https://forums.xfinity.com/conversations/your-home-network/sudden-data-usage-spike-at-oct/68e1cb7c566ff24c9b81b14b
• https://forums.xfinity.com/conversations/your-home-network/sudden-massive-increase-in-data-usage/6564d0071863db460fe80194