Why Does My Internet Keep Disconnecting? (Modem & Router Fixes)
Few things are more frustrating than an internet connection that drops out at random. Whether you are on a video call, streaming a show, or just browsing, a connection that keeps cutting out makes everything harder. The good news is that most causes are straightforward to diagnose and fix at home without calling your internet provider.
This guide walks you through the most common reasons your internet keeps disconnecting and gives you clear, step-by-step fixes for each one.
Key Takeaways
- Most internet disconnections trace back to your modem, your router, or the cabling between them — not your internet provider. A simple power cycle fixes the problem more often than you might expect.
- Your modem and your router do different jobs. The modem connects you to your ISP, while the router creates your Wi-Fi network. Knowing which device is failing saves you time troubleshooting.
- Overheating, outdated firmware, and loose coaxial cables are the top modem-side culprits, while Wi-Fi interference, too many connected devices, and weak signal strength are the most common router-side causes.
First, Identify Your Equipment: Modem vs. Router
Before you start troubleshooting, you need to know which device is which. Many people use these terms interchangeably, but they are two separate pieces of equipment with different roles.
Your modem is the device that connects directly to the coaxial cable (cable internet) or phone line (DSL) coming from your wall. It translates the signal from your internet provider into data your home network can use. It typically has a coaxial input on the back, an Ethernet port or two, and a row of status lights on the front.
Your router is the device that creates your Wi-Fi network and allows multiple devices to share your internet connection. It connects to the modem with an Ethernet cable and usually has several Ethernet ports and one or more antennas.
Combination units (gateway devices): Many internet providers supply a single box that functions as both a modem and a router. If you only have one device and it connects to both the wall coaxial cable and your Wi-Fi devices, you have a gateway. The troubleshooting steps below still apply — just know that both modem and router functions live inside that one box.
How to Diagnose the Problem
Before trying random fixes, take two minutes to figure out where the problem actually is. This saves you a lot of time.
Step 1: Check if it is your Wi-Fi or your entire internet connection. When your internet drops, plug a computer directly into your modem or router using an Ethernet cable. If the wired connection works fine but Wi-Fi does not, the problem is your router or Wi-Fi signal. If even the wired connection drops out, the problem is likely your modem or your ISP.
Step 2: Look at your modem lights. A healthy modem will show solid (not blinking) lights for Power, Online, and Downstream/Upstream. If the Online light is off or blinking repeatedly, your modem is struggling to maintain a connection with your ISP.
Step 3: Check for patterns. Does the internet drop at the same time every day? That can indicate network congestion in your area. Does it drop when you microwave food or use a cordless phone? That points to wireless interference. Does it happen only on certain devices? That narrows it to those devices specifically.
Modem-Side Fixes
If your diagnosis points to the modem, work through these fixes in order.
1. Power Cycle Your Modem
Unplug your modem from power. Wait 30 seconds. Plug it back in and let it fully restart, which usually takes two to three minutes. Watch for all status lights to go solid. This clears temporary errors in the modem's memory and forces it to re-establish a fresh connection with your ISP.
2. Check Your Coaxial Cable and Connections
A loose or damaged coaxial cable is one of the most overlooked causes of intermittent disconnections. Make sure the coaxial cable is finger-tight at both the wall outlet and the back of the modem. Inspect the cable for visible damage, sharp bends, or crushed sections. If the cable is old or damaged, replace it.
3. Check for Overheating
Modems generate heat, and if yours is enclosed in a cabinet, stacked under other devices, or sitting in direct sunlight, it may be overheating and shutting down intermittently. Move your modem to an open, well-ventilated area. It should not feel hot to the touch during normal use.
4. Update Your Modem Firmware
Outdated firmware can cause connection instability. Most cable modems receive firmware updates automatically from your ISP, but the process sometimes stalls. Log in to your modem's admin panel (usually by typing 192.168.100.1 into your browser) and check the firmware version. Then visit the manufacturer's website to see if a newer version is available. If your ISP manages firmware updates, contact them to confirm your modem is running the latest version.
5. Check Your Signal Levels
Your modem's admin panel will show downstream and upstream signal levels. For DOCSIS 3.0 and 3.1 cable modems, downstream power should generally fall between -7 dBmV and +7 dBmV, and upstream power between 38 dBmV and 48 dBmV. Signal-to-noise ratio (SNR) should be above 33 dB for reliable performance. If your levels are outside these ranges, the issue is likely with your cable line or your ISP's infrastructure. Contact your provider and reference the specific numbers you see so they can act on it quickly.
6. Check for DOCSIS Channel Bonding Issues
In your modem's admin panel, look at the number of locked downstream and upstream channels. If channels are dropping or unlocking frequently, this indicates a signal problem between your modem and the ISP. Frequent channel drops often point to a damaged cable line, a failing splitter, or a problem at the ISP's node. Remove any unnecessary coaxial splitters between the wall and your modem, as each splitter weakens the signal.
7. Consider the Age of Your Modem
Modems do not last forever. If your modem is more than four to five years old, its internal components may be degrading. Older DOCSIS 3.0 modems may also struggle to keep up with faster internet plans. Upgrading to a newer DOCSIS 3.1 modem can resolve persistent disconnection issues and often improves overall speed.
Browse Our Recommended Modems →
Router and Wi-Fi Fixes
If your wired connection is stable but Wi-Fi keeps dropping, the problem is on the router side.
1. Power Cycle Your Router
Unplug your router, wait 30 seconds, and plug it back in. If you have a separate modem and router, power cycle both. Restart the modem first, let it fully connect, and then restart the router.
2. Reduce Wireless Interference
Many household devices operate on the same 2.4 GHz frequency as your Wi-Fi. Microwaves, baby monitors, cordless phones, and Bluetooth devices can all cause interference. If your router supports 5 GHz, switch your devices to the 5 GHz band. It offers less range but significantly less interference. Keep your router away from large metal objects, thick walls, and other electronics.
3. Change Your Wi-Fi Channel
If you live in an apartment or densely populated area, neighboring Wi-Fi networks may be competing on the same channel. Log in to your router's admin panel and try switching to a less congested channel. For 2.4 GHz, channels 1, 6, and 11 are preferred because they do not overlap. For 5 GHz, there are many more non-overlapping channels available.
Read: Best Wi-Fi Channel Settings (2.4 GHz & 5 GHz) →
4. Update Your Router Firmware
Log in to your router's admin panel and check for firmware updates. Manufacturers regularly release updates that fix bugs, improve stability, and patch security issues. Many modern routers support automatic updates — make sure this feature is turned on.
5. Reduce the Number of Connected Devices
Every device connected to your Wi-Fi takes up bandwidth and router resources. If you have dozens of smart home devices, phones, tablets, and computers all connected at once, your router may be overwhelmed. Disconnect devices you are not using, or consider upgrading to a router or mesh system designed to handle more simultaneous connections.
6. Reposition Your Router
Place your router in a central, elevated location in your home. Avoid placing it on the floor, inside a closet, or behind furniture. Wi-Fi signals radiate outward and downward, so a higher, central position gives you the best coverage throughout your home.
When to Call Your Internet Provider
If you have worked through the steps above and your internet is still disconnecting, the problem may be on your ISP's end. Call your provider if:
- Your modem signal levels are consistently out of range and you have already checked your cables and splitters.
- Your modem's event logs show frequent T3 or T4 timeout errors, which indicate communication failures with your ISP.
- Your neighbors are experiencing the same issue, which suggests a problem at the local node.
- The disconnections started after a service change or an outage in your area.
When you call, have your modem model, signal levels, and a description of the problem ready. This helps the technician skip basic troubleshooting and get to the root cause faster.
Frequently Asked Questions
Why does my internet drop at the same time every day?
This usually means network congestion. During peak hours, typically in the evening, more people in your neighborhood are online at the same time. Your ISP's local node may not have enough capacity to handle the load. If this is a regular occurrence, contact your provider. It can also be caused by a scheduled device or software update that temporarily disrupts your connection.
Why does my Wi-Fi keep disconnecting but Ethernet works fine?
If your wired connection is stable but Wi-Fi drops, the issue is with your router or your wireless environment, not your modem or ISP. Common causes include wireless interference from other electronics, an overcrowded Wi-Fi channel, outdated router firmware, or too many devices connected at once. Try switching to the 5 GHz band and updating your router firmware.
How often should I restart my modem and router?
There is no hard rule, but restarting your modem and router once a month is a good preventive habit. A restart clears temporary errors, refreshes the connection with your ISP, and frees up memory. If you are experiencing frequent disconnections, a restart should always be your first troubleshooting step.
Can a bad Ethernet cable cause internet disconnections?
Yes. A damaged or low-quality Ethernet cable connecting your modem to your router can cause intermittent drops. Look for visible damage, and try replacing the cable with a known good Cat5e or Cat6 cable. The same applies to the coaxial cable connecting your modem to the wall — a loose or damaged coaxial connection is one of the most common causes of modem disconnections.
How do I know if my modem is too old?
If your modem is more than four to five years old, it may be due for a replacement. Check whether it supports the DOCSIS version your ISP recommends. Most ISPs now recommend DOCSIS 3.1 for plans above 300 Mbps. Older DOCSIS 3.0 modems can struggle with higher-speed plans and may not receive firmware updates from your provider, leading to stability issues over time.
Why does my internet disconnect when I use the microwave?
Microwaves operate on the 2.4 GHz frequency, which is the same frequency used by many Wi-Fi routers. When you run the microwave, it can leak enough 2.4 GHz interference to disrupt your Wi-Fi signal. The fix is to connect your devices to the 5 GHz Wi-Fi band, which is not affected by microwave interference. If your router does not support 5 GHz, try repositioning it farther from the kitchen.
Do I need a separate modem and router, or is a combo unit fine?
Combo units, also called gateways, work fine for most households. However, using a separate modem and router gives you more flexibility, typically better performance, and makes troubleshooting easier since you can isolate each device independently. If you are experiencing persistent connection issues with a gateway, upgrading to separate devices is worth considering.
