The fact that that MAC comes back with nothing in the MAC Vendor OUI lookup normally means its a randomly generated one, probably like Brash has said below a mobile device and the dashboard has confused wireless with wired  ... View more

You just need to change the date format to US mm/dd/yyyy tt:tt format   https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Using_Exported_Client_XML_Data ... View more

Reading this entire thread we have experienced very similar issues which has been broken down and resolved in nearly all clients now that were experiencing similar issues to the ones discussed in this thread.   *Realtek chipsets on some laptops required driver upgrades, these devices would disconnect instead of roaming correctly. This is a known issues apparently with Realtek NIC's.   *IntelAX2xx drivers required updating, as they were experiencing "roaming on the spot" issues with tens of associations over and over to the same AP.    *We disabled 802.11v aka "Client Balancing" in Radio settings on the SSID's.   *We had Meraki disable 802.11k BSS Transsision, this can only be done by Meraki and a support case will be required.   Rolling back firmware was not an option for us. The above changes have given us stability for most clients now on version 29.6.1 and we continue to work on additional data capture to resolves issues with the last of our clients with our customers. ... View more

I would be really interested in the output of that meeting, is there a way to manually disabled 11k, 11v on Intel cards? ... View more