​​​​​​​Fix Deco Disconnecting and Internet Instability Issues

An unstable internet connection can be frustrating. This guide will help you figure out why your Deco keeps disconnecting and how to fix it. We’ll walk you through identifying the issue type and solving it step by step.

Key Takeaways

• Observe the Deco LED status when the Internet drops; it tells you the exact problem type (main Deco, satellite, client devices, or random reboot).
• Follow targeted troubleshooting steps for main Deco, satellite Deco, unstable clients, or random reboots.
• If the issue persists after trying the fix, contact TP-Link Support with the information listed in the Need More Help section for faster support.

Before you begin

ensure all Deco units are running the latest firmware. If not, follow this guide to upgrade your Deco firmware before proceeding: How to Update TP-Link Deco Firmware (3 Methods)

How to Identify the Problem Type

When your internet drops, please check the LED light on your Deco units. This tells you what’s wrong:

Main Deco shows solid red light: the main Deco lost connection to the modem or ISP. The whole network has no Internet. Go to Fix for Unstable Main Deco Network.

Main Deco shows solid green or white light, but satellite Deco is flashing red or solid red: the main Deco works fine, but the satellite lost connection to it. Go to Fix for Unstable Satellite Deco.

All Deco units show solid green or white light, the Deco network is connected to the Internet, but your devices (phones, laptops, etc.) keep disconnecting. Go to Fix for Unstable Clients.

Deco LED changes in this order: off > solid yellow > solid red > solid white/green, the Deco is rebooting on its own. Go to Fix for Deco Random Reboot.

Fix for Unstable Main Deco Network

If your whole Deco network keeps losing internet, try these steps:

• Check all Ethernet cables. Ensure they are firmly plugged in. Replace any cables that look old or damaged.
• If the upstream device is a pure modem (no Wi-Fi), connect only the main Deco to its LAN port. Do not connect other devices.
• Try different ports on both the upstream device and the main Deco.
• Test the upstream connection. Connect a computer or another router to the upstream device using the same Ethernet cable. Watch for a while to see if the connection stays stable.
  • If the other device also disconnects, or you don’t have a device to test, please contact your Internet service provider (ISP) for help.
  • If the other device stays connected, change the DNS server in the Deco app. (Deco app > More > Internet Connection > Internet Settings > DNS Address > Manual > Set to 8.8.8.8 or 8.8.4.4)

Fix for Unstable Satellite Deco

If you have more than one satellite Deco, please first check which ones are flashing red or solid red:

Specific Satellite Deco Is Flashing/Solid Red

• Swap the problematic satellite with a working one (move them to each other’s location). If the disconnection follows the unit, contact TP-Link support.
• If the disconnection stays at the original spot, the problem is likely interference or obstacles. Adjust the satellite’s position following Deco Placement Guide.

Multiple or All Decos Are Flashing/Solid Red

Check how your Decos are connected:

• Via Ethernet: unplug all the cables, and remove any network switches between Decos. Wait a few minutes and see if the connection improves.
• Via Wi-Fi: Move the Decos closer together. Reposition them as per Deco Placement Guide.

Fix for Unstable Clients

If your devices keep disconnecting but all Decos ’ LEDs remain solid white or green, please identify which devices are affected:

If only smart home devices (cameras, plugs, sensors, bulbs) disconnect, please refer to Settings to Fix Smart Home Devices Dropping.

For other wired devices:

1. Swap the Ethernet cable and try a different port on the Deco unit.

2. Connect the device to a different Deco unit to see if the issue follows the device or the unit.

3. If the device connects through a switch, connect it directly to a Deco unit instead.

For other wireless devices: enable a Guest Network with the 5GHz band only (Deco app > More > Guest Network), connect some of the problematic devices to it, and see if the connection is stable.

If a device cannot connect to the Deco Wi-Fi at all, see Why My Devices cannot connect to Deco Wi-Fi.

Fix for Deco Random Reboot

If a Deco’s LED changes in this order: off > solid yellow > solid red > solid white/green, it means the Deco is rebooting on its own. Please try these steps:

1. Ensure the problem Deco is using its original power adapter.

2. Swap the power adapter with another working Deco’s.

3. Swap the problem Deco with a working one (move them to each other’s location). If the problem Deco is the main Deco, change another working satellite Deco to be the main Deco.

Need More Help?

If you’ve tried all the steps above and your Deco is still disconnecting, contact TP-Link Support. To help us fix your issue faster, please provide the following information:

For All Problem Types

• What troubleshooting steps you have already tried and the results.
• The LED status on your Deco units when the problem occurs. Note whether the light is solid or flashing.
• How often the issue happens, and whether it ever recovers on its own.
• The TP-Link ID/email used to manage your Deco units.

For Unstable Main Deco

• Your ISP name.
• The model number and LED status of the upstream device.
• The system log from Deco's web interface (Guide: How to Get Deco System Log). Get it within 1 hour of disconnection and do not reboot the Deco.

For Unstable Satellite Deco

• Your network topology (how the Decos are connected: via Ethernet or Wi-Fi, and in what order).
• Photos of your Deco placement (showing where each unit is located).

For Unstable Clients

• Your network topology (how the Decos and affected devices are connected: via Ethernet or Wi-Fi, and in what order).

• The model number of the affected devices.

For Deco Random Reboot

• The serial number of the problematic Deco.
• Your proof of purchase.

To get to know more details of each function and configuration, please go to the Download Center to download the manual for your product.