Perhaps a hard reset would fix

but I'm not going to bother trying that because who wants a device that you have to hard reset and set up every two weeks

If you happen to mess up, like I did, do a hard reset by holding the reset button for 10 seconds

Without going into great detail, I have tried about 5 methods to get this to work, including enabling/disabling DHCP, using a static IP or getting IP from DHCP, setting AP to same SSID/Config, latest firmware, hard resets, nothing works.

A hard reset fixed the issue, but it had the issue every time.

I have tried everything but this thing refuses to play nice with my existing TP-Link router (TL-WR1043ND R)