@MichaelPbl 

Hello, thanks for your requesting, we can do some troubleshooting first to narrow down this issue and try to fix it. 

1. What is the led status of Archer AX50 when it lost connection?

2. With computer connected to the AX50 at that time, can you get internet from it? And please click here to get the IP address and gateway. Then login to the web UI of the C5 and get a screenshot of the advanced-status page.

3. To do a comparison analysis, when the Archer AX50 stops working, please connect your computer to the modem directly to test whether you can access internet. 

4. Besides, please tell us the current firmware version. 

Thanks in advance. Have a nice day. 

@MichaelPbl 

Hello, thanks for your valued reply.

Considering only the streaming and online games have this issue, it is suggested to enable QoS to prioritize the internet traffic of specific online activities, including streaming and online games. You can go to Advanced-QoS page on the web UI to set it up. 

Besides, you can enable UPnP for specfiic devices, like the PS, PS4 to make online games run smoothly. You can go to Advanced-NAT Forwarding-UPnP page to do that. 

If still the same, please show us a screenshot of the ping result where you saw the packet loss. 

May it help, and have a nice day. 

@TERAX 

Thank you for posting on the TP-Link Community.

Do you mean the issue persists even when you plug the computer directly into the AX50 LAN with cable? Have you every compared this by connecting the same computer to the ISP modem directly? BTW, who is your ISP?

Try to disable the QoS completely on the AX50, on the Tether Homecare page>>QoS, check and ensure it is on the Standard Mode, then get back to the Clients' page, check all the clients connected to the router and ensure the High Priority is disabled.