@nickb12 Hello, 

Thank you for your clear post. 

Do you mean powerline Led is Solid On when one of the extender lost Internet?  May I know when did you purchase the powerline extenders and when did this issue begins. 

At that time, make sure computer is connected to that powerline extender by cable or by WiFi, and e check the IP address and gateway  and send us a photo, thank you.

Please ping IPv4 default gateway, and send us the ping result at that time:

How to check IP address : https://www.tp-link.com/support/faq/838/

How to use Ping command: https://www.tp-link.com/support/faq/425/

At the same time we'd like to follow up your case via email with subject title  " 【Forum ID 257790】and may need to escalate case for further analysis, please check your inbox