Hello @FrancisJ ,

Welcome to our community.

For your case, here are some suggestions:

1. Check and update the Firmware of the router and clients:

1) On the router:
• Log in to your router's web interface (http://tplinkwifi.net).
• Go to Advanced > System > Firmware Update and ensure your router is running the latest firmware.

2) On the clients:

• Update the network adapter drivers and system software on your devices (PCs, phones, smart TVs, etc.).

2. Change DNS Server settings on the router:

Change the DNS Server: In the web interface, go to Advanced > Network > Internet > Advanced Settings and set the DNS servers to 1.1.1.1 and 8.8.8.8.

Alternatively, disabling the DNS server can also provide quick verification. It might be that high-bandwidth videos are failing to load due to speed limits.

3. Verify the modem can load video normally:
Connect your PC directly to your modem (bypassing the router) and check if your clients can load video normally. If not, contact your ISP.