Resolved! Some PCs seem bound to a single AP, they refuse to handoff even when out of range of that AP, instead it shows no SSIDs at all, other PCs in the same room show the networks and can connect via other APs.
I have a small, simple, flat network. Single VLAN, single building, 3 floors, 14 APs, and 100-200 devices at any given time, all using the default profile. I am in the midst of a staggered upgrade from AP330s to AP650s, the AP that is holding thes...