I just tried moving the controller from my old laptop to a new one.  I saved a backup of the configs, and then restored it on the new machine.  All the APs go down; the WLANs show up sporadically and go down.  I've tried removing and re-adding the APs, and it usually works for a bit but stops.  The SSIDs stop broadcasting and devices lose connection, even though the Controller software shows the APs in inventory, connected.

In the end I had to boot my old laptop up again and start the Controller there, and everything goes green again.  I'm running Omada Controller v3.2.14 on both laptops.