If you have a captive portal that is configured so that the client has to re-authenticate every period of time, this is normal, what were you expecting to happen? https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Splash_Page_Frequency#:~:text=On%20a%20RADIUS%2Denabled%20network,default%20value%20is%2030%20days.
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