Hello,
Yes, there have been observations about not all 802.3af switches will adequately power the 7982 model APs.
https://support.ruckuswireless.com/answers/000001623 The common workaround, if you have enough ports, is just to not connect two APs in adjacent ports, either
side by side or above/below each other, so only 2 APs draw power from a 4 port block of switch ports, often
powered by a single tranceiver each.