@toweliechaos 850RE is connected to your router wifi directly, but not to WPA4220， right? Please check this: How to improve my wireless speed or range?

When the issue happens, please login to RE455, then sent me a screenshot of that status page. Then I can check that, then provide some suggestion maybe.

@7m4hnj6e What's the model NO. of your extender? TL-WA850RE or WA855RE? Please check this to setup extender: How to configure Range Extender via Tether APP

Please help to confirm the following information: 1. What's the hardware and firmware version of your RE305? 2. Your game device is connected to RE305 via cable or wireless? Try 5G wifi.

@HarryCat You have different wifi name for RE450 and RE650, right? Actually, the tplinkrepeater.net only work to the one extender your phone/PC are connecting to. Or you could use RE450 and RE650‘s...

Please check the 5G wifi channle on your router, fix it to channle 36. Then check that on RE200.