That's the one. And the reminder of the URL found the threads discussing workarounds:
https://www.mobileread.com/forums/sho....php?p=2377037 and to a lesser extent
https://www.mobileread.com/forums/sho....php?p=2581112.
And I think Rev Bob is correct. If the fetch of the URL fails, it prompts you to connect to a new network and doing so drops the saved password.