Hmm, so I can get the network-manager back on. But then the country code resets (according to raspi-configure) to "not set". But it is still set in the wpa_supplicant.conf file. Regardless, that didn't seem to fix the connectivity issue through the browser.

A few other configurations to test. But so far, I haven't been plugging/unplugging any USB cables. some of the troubleshooting has been done with just the rpi4 to power and nothing else, so I don't think USB or HDMI interference are the root cause here (but sounds like a problem I might have in the future ;)).
 

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