@Jay_Harman 

Thanks for reaching out. I understand that after upgrading your Deco Mesh system, you noticed that your network slows down significantly when your MyQ internet gateway hub is connected, but works well when the hub is unplugged. You’re concerned about possible interference or compatibility issues between the MyQ hub and your Deco Mesh network, especially with many IoT and 5GHz devices connected.

To address network slowdowns, lag, or instability on your Deco Mesh network, please try the following troubleshooting steps:

1. Test Your Internet Connection:
• Connect a PC or laptop directly to your modem (bypassing Deco) to see if the issue persists. If you still experience slow speeds, please contact your Internet Service Provider.

2. Check Deco QoS Settings:
• Open the Deco app and go to MORE > QoS. Ensure the bandwidth setting matches your subscribed Internet speed.

3. Review Device Settings in Deco App:
• In the client list, select your device and make sure 'Speed Limit' is disabled and 'Connection Preference' is set to 'auto' (default).

4. Parental Controls:
• In the Parental Control section, confirm that your devices are not restricted by any profiles.

5. Satellite Deco Placement and Connection:
• If using satellite units, ensure their signal strength is at least 2 bars. If using Ethernet backhaul, double-check the Ethernet connection and confirm that "Ethernet Backhaul" is displayed in the Deco app.

6. For Wired Devices:
• Connect your device directly to the main Deco and try different Ethernet ports for comparison.

7. For Wi-Fi Devices:
• Make sure your devices are connected to the nearest Deco unit with a strong signal, and use the 5GHz or 6GHz band instead of 2.4GHz for latency-sensitive activities.
• Ensure devices are connected to the main network, not the guest or IoT network.

If you continue to experience issues specifically when the MyQ hub is connected, it may be causing network congestion or interference, especially if it is an older model or not fully compatible with your new mesh system. You might also want to:
• Check if the MyQ hub is using a large amount of bandwidth or causing excessive network traffic in the Deco app's client list.
• Try connecting the MyQ hub to a different Deco unit or moving it further from your main Deco to reduce potential interference.
• Ensure your Deco firmware is up to date.

If the problem persists, please contact TP-Link support and provide details of the troubleshooting steps you've tried, as well as any patterns you notice regarding the MyQ hub's impact on your network.

Let us know if you need further assistance!