@JSchnee21 thank you for the answer! Yes, I could use the Omada thing, but I'd rather not. And while you can reset the device via the web interface, there's no way to schedule a regular reset, which...

I thought I might be able to use ssh from another machine to schedule regular reboot of the AP, but it turns out that although the username is "root", I'm somehow logged in as a privilege-starved...