Try disabling the client load balancing.
https://documentation.meraki.com/MR/Other_Topics/Client_Balancing#:~:text=Client%20balancing%20uses%....
And if the 802.11r and 802.11w are enabled, try disabling both.
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
Please, if this post was useful, leave your kudos and mark it as solved.
