Key Takeaways
- Most CenturyLink dropouts are caused by an overheated or outdated modem, loose phone or fiber connections, or missing DSL filters, and a proper restart fixes the majority of cases.
- Before troubleshooting your equipment, check for a CenturyLink outage in your area, since network problems on their end cannot be fixed from your home.
- If your internet still disconnects after restarting the modem, checking every cable, and moving the modem to a cool, open spot, the line itself may be the problem and you should request a technician visit.
Why Does CenturyLink Internet Keep Going Out?
CenturyLink internet usually keeps going out because of one of five things: an overheating or aging modem, a loose or damaged cable, a missing DSL filter on a phone jack, interference on the line, or an outage in your area. The good news is that most of these are quick fixes you can do yourself in under 15 minutes, no technical experience required.
Work through the steps below in order. Each one rules out a common cause, starting with the easiest.
Step 1: Check for a CenturyLink Outage First
If the problem is on CenturyLink's end, nothing you do at home will fix it. Rule this out before touching your equipment.
How to check
- Open the CenturyLink outage page on your phone (use mobile data if your internet is down) and enter your address or sign in.
- You can also open the My CenturyLink app, which shows outage alerts for your account automatically.
- If an outage is listed, wait it out. There is nothing to fix on your end.
Step 2: Restart Your Modem the Right Way
A restart clears the modem's memory and forces it to reconnect to CenturyLink's network with a fresh signal. This fixes more dropout problems than any other step.
How to restart a CenturyLink modem
- Unplug the power cord from the back of the modem.
- Wait a full 60 seconds. This matters: a quick unplug-and-replug does not fully reset the connection.
- Plug the power cord back in.
- Wait 3 to 5 minutes for the lights to stabilize. On most CenturyLink modems, you want a solid green or blue internet light.
Do not press the small recessed reset button on the back unless CenturyLink support tells you to. That button erases your settings, including your Wi-Fi name and password.
Step 3: Check Every Cable and Connection
Loose or damaged cables are one of the most overlooked causes of internet that cuts in and out. A cable that is 90 percent plugged in can work fine for hours, then drop the connection when it shifts slightly.
What to check
- DSL customers: Make sure the phone cord runs snugly from the wall jack to the modem's DSL port. Unplug it and plug it back in firmly on both ends.
- Fiber customers: Check the thin fiber cable going into the ONT (the small box CenturyLink installed, usually on a wall) and the Ethernet cable between the ONT and your modem or router.
- Look for kinks, crushed sections, chew marks from pets, or cords pinched behind furniture. Replace any damaged cable.
- If your modem connects to a computer or mesh router by Ethernet, reseat those cables too. You should feel a click.
Step 4: Make Sure Every Phone Jack Has a DSL Filter
This step applies to DSL customers only. If you have CenturyLink Fiber, skip to Step 5.
DSL internet shares the same copper line as landline phone service. Every device plugged into a phone jack in your home (phones, fax machines, satellite receivers, medical alert systems) needs a small DSL filter between the device and the jack. Without one, that device sends noise down the line and your internet drops, often when the phone rings.
- Walk through your home and check every phone jack with something plugged into it.
- A filter looks like a short plug-in adapter labeled DSL or ADSL filter.
- The modem itself should NOT have a filter on its line, unless you are using a filter with a dedicated DSL port.
- Filters cost a few dollars and are available online or from CenturyLink.
Step 5: Fix Modem Overheating
Modems that run hot will disconnect repeatedly, especially in the afternoon and evening. If your CenturyLink modem feels hot to the touch and your internet drops at roughly the same times each day, heat is a likely culprit.
- Move the modem out of cabinets, closets, and entertainment centers.
- Give it a few inches of open space on all sides and keep the vents clear of dust.
- Stand it upright if it was designed to sit that way.
- Keep it away from heat sources like game consoles, cable boxes, and direct sunlight.
Step 6: Figure Out Whether It Is Wi-Fi or the Internet Itself
Sometimes the internet connection is fine and it is only the Wi-Fi signal dropping. Knowing the difference tells you what to fix.
The quick test
- When the connection drops, look at the modem's internet light. If it stays solid green or blue, your internet is up and the problem is Wi-Fi.
- Or plug a laptop directly into the modem with an Ethernet cable. If the wired connection stays stable while Wi-Fi keeps dropping, the problem is Wi-Fi.
If it is a Wi-Fi problem
- Move the modem to a central, elevated spot away from microwaves, baby monitors, and cordless phones.
- Connect to the 5 GHz network name if your devices are close to the modem, or 2.4 GHz for distant rooms.
- If large parts of your home have weak signal, a mesh Wi-Fi system paired with your CenturyLink connection is the long-term fix.
Step 7: Update or Replace an Aging Modem
Modem firmware is the software that runs the device, and CenturyLink pushes updates automatically to leased modems. A restart (Step 2) lets pending updates install. But hardware wears out too. If your modem is more than 4 or 5 years old and disconnects have gotten steadily worse, the modem itself may be failing.
- Leased modem: Call CenturyLink and ask for a replacement. If you pay a monthly equipment fee, replacements for failing hardware are typically covered.
- Owned modem: Check that your model is still on CenturyLink's compatible equipment list, and consider upgrading if it predates your current speed plan.
Step 8: When to Call CenturyLink
If you have restarted the modem, checked every cable and filter, ruled out overheating, and confirmed the drops happen on a wired connection, the problem is likely the line running to your home. Common line issues include corroded wiring, water in an outdoor junction box, and degraded copper on older DSL infrastructure.
Call CenturyLink support at 800-244-1111 or use the My CenturyLink app to run a remote line test and schedule a technician. When you call, mention the steps you have already tried. It speeds things up and usually gets you past the basic script.
Keep a simple log before you call: note the date, time, and weather each time the internet goes out. Drops that happen during rain point to water intrusion in the line, and a pattern log gives the technician a head start.
Frequently Asked Questions
Why does my CenturyLink internet go out at the same time every day?
Daily drops at consistent times usually point to modem overheating (afternoon heat), network congestion during peak evening hours, or a device on a timer causing interference. Move the modem to a cooler open spot first. If drops continue only during evening hours on DSL, ask CenturyLink whether your local node is congested.
What does a red light on my CenturyLink modem mean?
A red internet or status light means the modem cannot connect to CenturyLink's network. Restart the modem by unplugging it for 60 seconds. If the light stays red, check the DSL or fiber cable connection, then check for an outage. A red light that will not clear after a restart and cable check usually requires a call to CenturyLink.
Why does my CenturyLink internet go out when it rains?
Rain-related dropouts on DSL almost always mean water is getting into the phone line, an outdoor junction box, or underground wiring. This is CenturyLink's equipment to fix, not yours. Log the dates it happens and request a technician visit, since line repairs cannot be done from inside your home.
Is it my modem or my router causing the disconnects?
If you use a separate router, plug a computer directly into the modem with an Ethernet cable and bypass the router. If the connection stays stable, the router is the problem. If it still drops, the issue is the modem or the CenturyLink line. Most CenturyLink customers use a combined modem-router unit, in which case the wired test in Step 6 tells you whether the issue is Wi-Fi or the connection itself.
How do I check for a CenturyLink outage in my area?
Open the outage checker on the CenturyLink website or sign in to the My CenturyLink app, which flags outages tied to your address automatically. You can also call 800-244-1111 and the automated system will report known outages for your account.
Why does CenturyLink DSL keep disconnecting but not fiber?
DSL runs over copper phone lines, which are sensitive to distance, line noise, weather, and aging infrastructure. Fiber uses light over glass and is far more stable. If you are on DSL and disconnects persist after troubleshooting, check whether CenturyLink Fiber (Quantum Fiber in many areas) is available at your address, since upgrading often solves chronic dropout problems entirely.
Should I replace my CenturyLink modem?
Replace the modem if it is more than 4 or 5 years old, disconnects have gotten worse over time, it runs hot even in open air, or it no longer supports your plan's speed. If you lease from CenturyLink, request a free swap for failing hardware. If you own your modem, verify any replacement is on CenturyLink's approved equipment list before buying.
