I have a eleven IAP-105s and two IAP-144 APs at a remote site running Version 6.2.1.0-3.3.0.1 of ArubaOS. Occasionally all the APs disappear from the master. We have figured out that we can power off one of the APs (#8) and the missing APs will then re-connect to the master. We can then power on #8 AP and it will work for awhile before this happens again. My theory is that there is a network cable problem and #8 becomes the master even though we can not connect to it. Here are the results of the "show election statistics" command. The last spoof mac: 24:de:c6:c3:de:4b is the mac of the #8 AP.
master_beacon : sent=189074 rcvd=3773356
hierarchy_beacon: sent=0 rcvd=0
hierarchy_ack : sent=0 rcvd=0
beacon_req : sent=8 rcvd=48
beacon_resp : sent=48 rcvd=0
election wait : 21
timer slow : 0
master high cpu : 0
ap cpu usage : 7
Slave->Pot-Master : 1 time
Pot-master->Master: 1 time
Pot-master->Slave : 0 time
spoof arp rcvd: 1894
last spoof mac: 24:de:c6:c3:de:4b