Hi@Boihh,
May I know what is the issue of your router now? We need more information to confirm whether the problem comes from the router or other factors.
If the network is unstable, please try the following suggestions:
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?