There is none that I know of.... it's mainly up to the device to detect when there is a captive portal requiring sign in.. like on android or iOS..
It would also help to know your environment... Is this a Guest/Public network? Is the splash page mainly a TOS that the users need to accept? a little more information might be helpful...
What happens when user's are prompted for re-login and alert / notification?
Do they need to re-authenticate and enter there authentication details again?
You can check the splash page frequency to confirm how often it should be appearing for users. Under configure and then splash page.
Please refer to this link - https://documentation.meraki.com/zGeneral_Administration/Cross-Platform_Content/Splash_Page_Frequenc...
Hopefully, that helps.