This article may help it is a little old but does contain some of the Apple ecosystems roaming decisions. What are the minimum data rates set for your aps? You don’t have differing radio profiles for the different aps? https://www.stevenjordan.net/2016/03/fix-iphone-wi-fi-problems-part-i.html?m=1 https://support.apple.com/en-gb/HT206207 There is also some tools that Apple offer to run some capturing from the devices. There logs are pretty verbose but may help to capture what is prompting them to dissaccoiate. https://developer.apple.com/bug-reporting/profiles-and-logs/?name=Wi found this on the ubiquiti forums as well, although old does seem to point to fast roaming. https://community.ui.com/questions/Intermittent-Connectivity-with-Apple-Devices-and-Fast-Roaming/f3755d0c-101c-4e16-bd04-71e28b49a22d?page=11 Rather than disabling the 802.11r and k/v settings try enabling them. I believe there is an adaptive mode as well.
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