Hi@BeboYaz,
Welcome to our community.
Did you change any settings on the router recently?
May I know if your network topology diagram is as follows:
ISP modem—BE800 )))((( client devices
(Note: — stands for wired connection,)))((( stands for wireless connection )
Here are some suggestions that may help you:
1) Connect a PC directly to your modem to verify if your ISP's 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?
Best Regards.