yesterday we have checked on some more client OS (windows 7 professional sp1, windows7 enterprise sp1, windows 8 & windows 10) and we concluded as conectivity issue only with windows 7 enterprise sp1 os.
default wireless adapter setting on windows 7 enterprise is WPA2-Personal & AES (which is the currently connected ssid /our other working ssid details) (refer attachemnt no: 1) and once we manaully change the security type to WPA2-Enterprise and specify 802.1x authentication mode: as "user or computer authentication" (refer attachemnt no: 2), after from this device is able to connect to our new WPA2-Enterprise SSID.
can we resolve this issue without the manuall configuration on the devices (win7 enteprise sp1) as our most of devices having the same OS.