Hi @mgtech 

Thanks for posting in our business forum.

Please give more details and description about the problem.

In general, you can try to swap with different cables that have been tested well enough for the network.

Confirm if your ISP is stable and okay.

The fiber line from the ISP to your home.

Make sure you have configured the WAN interface properly. DNS is also very important.

Troubleshooting Techniques for Laymen

If you recently purchased the router, please note that the ER605 V1 has been EOL. We are no longer manufacturing this version 1. We would recommend you purchase V2 if you expect abundant feature updates.