Have you checked the Air Marshal feature? https://documentation.meraki.com/MR/Monitoring_and_Reporting/Air_Marshal I don't know if this will help in this specific case, but it's worth checking out. It would be your best bet. Packet Floods Clients or APs that are sending an excessive number of packets to your AP. Packets are monitored and classified based on multiple categories including beacon, authentication and association frames. An excessive number of any category of packets seen within a short time interval will be marked in Air Marshal as a packet flood.
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