@JvDMy Great job. I'm going to mark your reply as the “Recommended Solution” to close this topic so others can also benefit from the solution.

andreaippo wrote @Kevin_Z Hello, yes both are connected to the 2.4 band and the signal is weak cause it's upstairs. The router seems to do a good job at picking the least congested channel, but still...

Hello @DGoldwas Thank you for reaching out to us and welcome to the TP-Link community. We just found you created a support ticket by sending an email to support forum, we will discuss it via email...

Hello @n8r3796 According to this configuration FAQ, Archer AX21 doesn't support Connection Alerts: How to configure Connection Alerts on Tether App

Hello @em1n Can I know who is your ISP? When you are talking about the speed you got from Archer C80, Is it referring to the wired speed or wireless? How many devices are connected to the C80 at that...

@NickNotts Hello Nick, please check and update the router firmware to the latest official version, which could be Archer AX72_V1_1.1.2 Build 20220520, then monitor if the issue will disappear. You...