Authentication Error Occurred

I have not tried to switch back from the Guest network since my last post, but I can say that my device has remained very stable since then and since I updated the Orbi to allow access to the main network from the guest network, I seem to have full functionality to control my various home automation systems from my smartphone as well.  

While some are calling this clearly a Samsung issue, I disagree.  This is an incompatibility between this particular Samsung device with this particular update and the Orbi device.  I don't have any issues with my smartphone connecting to wifi reliably on any other wifi network.  I don't have any trouble with my Orbi using any other device.  Yes, this started occuring with the Nov 4 Android Update and no, the more recent update to the GS6 has fixed the issue.  I actually have two GS6 smart phones and they both experience the same issue and both work just fine on the guest network.

I really have no idea why the guest network works and the primary network does not.  I should add that I did enable security on the guest network as well, so it's not really a "guest" network any longer.  All I can say is that this workaround works and I've seen no downside to using it.  Now, if you do have guests and make a habit out of giving them the guest network wifi but don't want them on your primary network, this would not be a good workaround for you.