I just got the shield notification for the first time. This is after the 4.3 update, but no other installs. It also occurred over an hour after I got home, turned on my wifi, and connected to my home network, so it may not necessarily be linked directly to wifi state. To be fair though, I live in an apartment, with lots of password-protected wifi networks, so it is a possibility that they may have caused it. Plus, my home network is already known. I've not updated the security policy as prompted to by the phone, nor have I installed Knox from the shortcut that showed up in apps. Figure I'll go ahead and do it to see if it makes a difference.
EDIT: Just turned wifi on and off, and got the notification... That's annoying as hell....
10-29-2013 06:44 PM