I get this alert quite a bit. In our case, when a location loses power and comes back or if a switch is rebooted (causing the APs to go down) then come back up. The APs come back up with an IP of 1.1.1.1 (temporarily) for some reason. Then they go to the IP assigned to them.   If your issue is the same, it's not the alert causing the outage, it's the outage causing the alert.   Verify the mac addresses shown in the alert with your APs ... View more

If you have checked the physical status of your connection to the port on said VLAN.  Then you should also check if that VLAN is all the way to the firewall. You can quickly check this by pulling the MAC address table on the end switch where the user is and see if you can find the MAC address of the firewall on that VLAN. It also helps if you start a ping on the firewall to the broadcast address of that VLAN. ... View more