I too have had several complaints about this...I've got 2 different AOS versions, a 6.4.1.0 and a 6.3.1.6. So far, only have complaints in 1 area on the 6.4.1.0 code version... I went there myself, with several different machines (android, mountian lion, yosemite, and windows 7), and experienced issues with all but the android, all simultaneously.
My initial complaint came from a student who had just upgraded to yosemite... I've got a ticket open with Dell, who in turn has one open with Aruba on this matter.
My experience was not only a disconnect - reconnect, but a failure to connect. I have several 802.1x networks, hitting several different radius servers, as well as an open network...During this failure to connect time-period, not a single SSID worked for me on the laptops... My android phone however, no issues....