@Qintiy Hi, may I have a screenshot of the ping results when there is ping spikes issue? To assist you efficiently, I've forwarded your case to the TP-Link support engineers who will contact you with...

@dejwid Hi, to assist you efficiently, I've forwarded your case to the TP-Link support engineers who will contact you with your registered email address later. Please pay attention to your email box...

@tonyjp2022 Hi, thank you very much for the feedback. Some of TP-Link routers have supported the DoH function, please refer to this thread: Wi-Fi Routers Support DoH and IoT Network

@Qintiy Hi, thank you very much for posting on TP-Link Community. 1. do you mean there is ping spikes issue when pinging the router LAN IP address no matter via wired or wireless connections? 2. How...

@SandsT Hi, what is the model no., hardware and firmware version of your TP-Link router? Are you connecting your modem to WAN port of the router? Please connect a computer to your modem with the same...

@dejwid Hi, for the main WiFi network, how often does the issue happen? and did you try changing channel from Auto to static one? such as channel 36, 40 etc. for 5G WiFi. In addition, please also try...