I'm now seeing multiple entries for one device which is a listed under its custom name (Nest in Hallway) as offline but also as Unknown and online connected to one of the disks. I was seeing my iPhone listed as offline when I was using it to look at the devices.
Another device on 802.11g was listed as using the disk on the other side of the house despite four disks being closer.
It's pretty hard to know what's real regarding the device list. I ended up resetting all 5 disks last night as they were pretty confused.