If you disable FT 802.11r on the SSID then every roam will be a full radius session meaning your clients will take longer to roam between AP's and the load on your NPS server could increase much if you have a high client count. If that does not sound appealing to you, then perhaps first try to fully troubleshoot the clients if possible. That means, check if the issue happens on specific clients (NIC model and driver version) or in case of IoT devices, the device as compared to other devices. I would personally not like to have to disable FT just for a handful of clients.
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