HI @CU35,

Thank you for reporting your issue to our community.

EX510 is a customized device specifically designed for local Service Providers. Its software is tailored to meet the unique requirements of these providers, ensuring alignment with their specific needs. While our technical support team is adept at providing general guidance and suggestions for products with standard, generic firmware. However, due to the specialized nature of the firmware on your device, our ability to provide troubleshooting may be limited.

We can certainly offer some troubleshooting tips that may help resolve your issue. Please consider the following:

1) Connect a PC directly into your modem to verify if your ISP Internet is stable.
    2) Make sure the Ethernet cable between your modem and the Router is connected properly, replaced old cables with new ones.
    3) Change the DNS Server of the Router, login the web management interface of the Router, go to Advanced > Network > Internet > Advanced Settings, change the two DNS Servers into 1.1.1.1 and 8.8.8.8. How to Change the DNS servers on the wireless router and DSL modem router (New UI)?
    4) Go to Advanced > System > Firmware Update to upgrade the firmware of the Router. How to Upgrade the Firmware on the TP-Link Wi-Fi Routers?

If the problem persists after trying these steps, we recommend contacting the technical support of your Service Provider who supplied the device, as they are best suited to provide the necessary assistance for your device.