My experience is much the same as Stephen's. I'm running Ruckus Cloud on 5 APs with multiple kinds of devices including MacBook Pro (2017), iMac 27" (2013) iMac 27" (2009), iMac 24" (2010), Home Pod, iPhone XS, 8+, 6S, 7, iPad Pro ... all with no issues.
Have you tried an SSID with a completely new configuration profile?
Are there any other centralised services on the network that could be at fault?
Good luck in finding the issue.