Also, check if 802.11r is enabled and if Cipherlab-9700 supports it (fast roaming). If 802.11r is enabled but not supported by handhelds -- this
may be reason for serious problems. If not sure, disable 802.11r and
802.11k and look if it improves response time when moving around. It
makes a huge difference with some devices which do not support
802.11r...
By the way, only mobile phones commonly support it (iOS 6+ and most Android phones). Laptops with W7/8 don't support, and W10 supports only with Radius authentication (not with WPA2/PSK), even if hardware is compatible. So normally you want to disable 802.11r to prevent issues...