Hey @Lingarajug,

You may also consider getting in contact with our support teams directly to troubleshoot the behavior, otherwise here are a few things you can try to troubleshoot further:

• Since you are able to get internet through the 1G port for a moment, it is likely a problem with the negotiation between the two devices. I would first try swapping out the Ethernet Cable between them.

• Decos uses Auto WAN/LAN Sensing for the Ethernet ports, so it's possible that this feature is causing that disconnect. On the main Deco, try only plugging in the wired connection from the ONT to see if the connection can be maintained.

• You are also moving to a lesser negotiation speed, so you may consider making sure that the ONT port is properly negotiating down to the correct speeds when the change occurs, if you have access to any of the settings from your ISP.

• If you have multiple XE200s, I would recommend reconfiguring your network and swapping the nodes. The change in hardware may be enough of a change to allow the connection since your ISP would detect it as a new "network". Do you happen to know if you receive a normal ethernet signal through the 1G port while using the 10G port for your internet?

• Lastly, if the device from your ISP supports Wi-Fi, make sure you have enabled Bridge or IP Passthrough Mode on the ONT - as this could easily explain the stability and disconnects.