Does the error follow if the device is connected to a different port? If you have a non-Meraki Switch connected see if the STP priority and also check on the dashboard which switch is elected as the Root Bridge. The error occurs when the switch is receiving unexpected BPDU packets from the port a.k.a. detecting loop. ... View more

Would suggest you to configure an SSID with the same configurations and check if the client is getting a splash page when he connects. Try to keep the Splash page frequency to minimum so that you can also try to disconnect the client and connect it again. This will isolate the issue further. ... View more