Xfinity Internet Keeps Disconnecting: How to Fix It

Step 1: Check modem signal levels in the admin page

Open a browser and go to 192.168.100.1 — this is your modem's internal status page. Look for downstream power levels between -7 and +7 dBmV and SNR above 30 dB. Levels outside this range indicate a cable signal problem that Xfinity must fix from the line.

Step 2: Inspect coaxial cable connections

Check every coax connection from the wall to the modem. Finger-tight is not enough — use a wrench to snug each connector. Look for corrosion (green or white residue on the connector), kinks, or sharp bends in the cable. A corroded or loose coax is the most common cause of Xfinity disconnections.

Step 3: Split the problem — bypass the router

Connect your laptop directly to the modem with an Ethernet cable, bypassing the router entirely. If disconnections stop, your router is the problem. If disconnections continue, the issue is the modem or the Xfinity line.

Step 4: Check the Xfinity outage map

Visit xfinity.com/support/status and log in to check for active outages in your area. Xfinity outages can appear as disconnections that look like local hardware problems. Node-level issues affect entire neighborhoods and only Xfinity can resolve them.

Step 5: Request a line check if T3/T4 errors appear

In the modem admin page (192.168.100.1) check the event log for T3 or T4 timeout errors. These indicate the modem cannot communicate with Xfinity's upstream servers — a sign of a line fault between your home and the node. Report these errors specifically when calling Xfinity support to get a technician dispatched.

Step 6: Replace modem if over 3-4 years old

Modems degrade over time. If your modem is more than 3-4 years old and showing signal problems, replacement is often faster than repeated technician visits. The Arris SB8200 (DOCSIS 3.1) and Netgear CM2000 are both compatible with Xfinity and handle gigabit plans well.

Frequently Asked Questions

Why does Xfinity disconnect at night?

Xfinity nighttime disconnections are typically caused by node congestion or modem T3/T4 timeout errors that worsen under load. Between 7 and 11 PM, high neighborhood usage stresses the shared DOCSIS upstream channels, causing the modem to lose sync. Check your modem event log for T3/T4 errors during the disconnection window.

How do I check if Xfinity is having an outage?

Go to xfinity.com/support/status and log in with your Xfinity account. You can also check the Xfinity My Account app, which shows active outages and estimated restoration times for your service address. Third-party sites like Downdetector.com also aggregate user-reported Xfinity outages in real time.

Should I restart my Xfinity modem?

Yes, but a proper restart means unplugging the modem's power cord for 60 full seconds, not just pressing a button. This clears the modem's DOCSIS connection state and forces it to re-register with Xfinity's CMTS. If restarting fixes it temporarily but disconnections return within hours, the problem is a line fault that requires a technician.