Ethernet Cable Keeps Disconnecting? Fixes That Work

If your Ethernet cable keeps disconnecting, the cause is usually a loose physical connection, a damaged cable, or a driver/power setting on your computer. This article walks you through the most common reasons and gives step-by-step fixes you can try in order, from simplest to most involved.

Why Ethernet Connections Drop

Wired internet is generally more stable than Wi-Fi, but it still depends on a complete electrical path from your router to your device. A drop happens when that path breaks for even a fraction of a second. The usual culprits are:

• Loose connectors – the plastic tab on the RJ45 plug breaks or doesn’t click fully into the port.
• Damaged cable – bent pins, cuts in the jacket, or a crushed section can cause intermittent contact.
• Faulty port – on the router, wall plate, or computer, worn contacts can lose connection.
• Power management – Windows or macOS may turn off the Ethernet adapter to save power, especially on laptops.
• Driver issues – outdated or corrupted network drivers can cause random resets.
• Electromagnetic interference – running cable next to power cords or motors can disrupt the signal.
• Router or modem problems – overheating, firmware bugs, or a dying power supply can cause all wired devices to drop.

If the disconnects happen every few minutes, it’s often a physical issue. If they happen once a day, it’s more likely a power management or driver problem.

Quick Checks Before You Reinstall Anything

1. Reseat the cable – unplug both ends, inspect the gold pins for dirt or damage, then plug back in firmly until you hear a click.
2. Try a different port – on the router, move the cable to another LAN port. On a laptop, use the other Ethernet port if you have one.
3. Swap the cable – if you have another Ethernet cable lying around, test with it. Cat5e or Cat6 is fine for home use.
4. Check the status light – the port on your computer and router should show a solid link light. If it blinks or goes off when the connection drops, that points to the physical layer.
5. Move the cable – if it runs alongside power cords, move it a few inches away. If it’s under a rug or behind a desk where someone steps on it, reroute it.

These five checks solve a surprising number of “keeps disconnecting” issues because the problem is often just a loose or damaged cable. If the connection still drops, move on to the software settings below.

Disable Power Saving on the Ethernet Adapter

Windows and macOS both have a feature that turns off the network adapter when it thinks it’s not being used. This is meant to save battery on laptops, but it can cause the adapter to sleep while you’re still on the network, leading to disconnects.

On Windows 10/11:

1. Open Device Manager (right-click the Start button and select it).
2. Expand Network adapters.
3. Right-click your Ethernet adapter (usually named something like “Realtek PCIe GbE Family Controller” or “Intel Ethernet Connection”) and select Properties.
4. Go to the Power Management tab.
5. Uncheck “Allow the computer to turn off this device to save power.”
6. Click OK and restart your computer.

On macOS:

1. Open System Settings (or System Preferences on older versions).
2. Go to Battery (or Energy Saver).
3. Look for any option like “Put hard disks to sleep when possible” – this doesn’t affect Ethernet, but check for “Wake for network access” or similar.
4. On a MacBook, also check Network settings: select your Ethernet service, click Details, then Hardware, and make sure “Configure” is set to “Automatic.”

If you’re on a desktop PC, power saving is less likely to be the issue, but it’s still worth disabling because some motherboards enable it by default.

Update or Reinstall the Network Driver

An outdated or corrupted driver is a common cause of random disconnects. Windows Update usually installs drivers automatically, but sometimes it misses a newer version or installs a buggy one.

1. Open Device Manager again.
2. Right-click your Ethernet adapter and select Update driver.
3. Choose “Search automatically for drivers.” If Windows finds nothing, go to the manufacturer’s website (Intel, Realtek, etc.) and download the latest driver for your specific model.
4. If updating doesn’t help, right-click the adapter and select Uninstall device. Check the box that says “Delete the driver software for this device” if it appears, then restart your computer. Windows will reinstall the driver automatically.

On macOS, drivers are part of the OS, so updating to the latest version of macOS usually fixes driver-related issues.

Check for IP Address Conflicts and Network Settings

Sometimes the connection drops because your computer loses its IP address or gets a conflicting one. This is more common on networks with static IPs or when a DHCP server is misconfigured.

• Renew your IP address: Open Command Prompt (as administrator) and type ipconfig /release then ipconfig /renew. This forces your computer to ask for a new IP.
• Reset the network stack: In the same Command Prompt, type netsh winsock reset and netsh int ip reset, then restart.
• Disable IPv6 temporarily: In Network Adapter Properties, uncheck “Internet Protocol Version 6 (TCP/IPv6)” and see if the drops stop. Some routers have buggy IPv6 implementations.
• Check for duplicate IPs: If you have a static IP set, make sure no other device uses the same one. Set your adapter to “Obtain an IP address automatically” unless you have a reason not to.

These steps are safe and reversible. If the problem persists, move to the router side.

Router and Modem Troubleshooting

If your Ethernet cable works fine when plugged into another device (like a game console), the problem might be your router. Here are some things to try:

1. Reboot your router and modem – unplug both for 30 seconds, plug in the modem first, wait for it to sync, then plug in the router.
2. Update the router firmware – log into your router’s admin page (usually 192.168.1.1 or 192.168.0.1) and look for a “Firmware Update” option. Check the manufacturer’s website for the latest version.
3. Change the Ethernet cable between modem and router – many people forget that this cable can also go bad. If it’s old or kinked, replace it.
4. Try a different LAN port on the router – if only one port keeps dropping, that port might be failing.
5. Check for overheating – if the router feels hot, move it to a ventilated area. Overheating can cause intermittent failures.

If you have a separate modem and router, make sure the cable between them is Cat5e or better and not longer than 100 meters (328 feet).

When to Replace the Cable or Call Your ISP

Ethernet cables are cheap and wear out. If you’ve tried the software fixes and the problem persists, replace the cable with a new Cat6 cable. It’s a small investment and eliminates the most common physical cause.

If a new cable doesn’t help, and the problem happens on all devices connected via Ethernet, it’s likely your router or your ISP. Contact your internet service provider if:

• Your modem shows “no signal” or “downstream” errors.
• The disconnects happen at the same time every day.
• All wired devices drop simultaneously.

In those cases, the issue is outside your home network, and a technician may need to check the line.

Frequently Asked Questions

Why does my Ethernet keep disconnecting but Wi-Fi works?
This usually points to the Ethernet cable, port, or adapter itself. Wi-Fi uses a different radio path, so if Wi-Fi is stable but Ethernet drops, the problem is in the wired path – try a new cable and a different port.

Can a bad Ethernet cable cause disconnects?
Yes. A damaged cable can cause intermittent connection loss, especially if it’s bent sharply, crushed, or has a broken clip. The cable may work when it’s in one position but fail when moved.

How long does an Ethernet cable last?
A quality cable can last many years if not physically stressed. However, cables that are repeatedly bent, stepped on, or exposed to heat can fail sooner. If you’re having issues, replacing a cable that’s more than 5 years old is a reasonable first step.

Does a shorter Ethernet cable improve stability?
Not usually, as long as the cable is within the 100-meter limit. Shorter cables are less likely to be damaged, but a good quality 50-foot cable works just as well as a 3-foot one.

Should I disable IPv6 to fix disconnects?
It’s worth trying if you’ve exhausted other options. Some routers have buggy IPv6 implementations that cause drops. Disabling IPv6 on your adapter is safe for most home networks and can be reversed easily.

Why does my Ethernet disconnect when I move my laptop?
This is almost certainly a loose connection. The port on the laptop may be worn, or the cable’s clip may be broken, so the plug shifts when you move. Try a new cable first, then check the port for bent pins.

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