I put my wifi-link in client mode and can see it on my network. I set a static IP, 192.168.4.137, and I can ping that IP all day.

However, I cannot pull up the HTTP settings page in a browser. It tries, then times out. And now, I cannot get to the unit to change it back to AP.

Any tips or tricks?

Hello,

unfortunately we have never encountered this issue. But problem can be fixed if you can send the module to us.
It require firmware reflashing with factory defaults in special mode.
You can ship to us according this page:
https://spirit-system.com/repair.php

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Spirit System developer