Ruckus ZoneFlex 7055 Access Point

[khang_chee_tan]

FYI, I have a wireless modem, this 7055 AP and a bridge. There're connected as
Clients => AP => Bridge => Wireless Modem (packets are being forwarded between Clients, AP and wireless modem)
I have turned off the Wifi Broadcast function for Wireless Modem while
The AP is currently broadcasting WiFi.
AP IP is 192.168.1.2
Wireless Modem IP is 192.168.1.1

Everything works well until recently I went to change the "IPv4 Connection Type" from
Static IP where settings are as below:
IPv4 Address: 192.168.1.2
IPv4 Subnet Mask: 255.255.255.0
IPv4 Gateway: 192.168.1.1

to DHCP.

After I press save changes, I can no longer access to the AP setting page which can be accessed through 192.168.1.2. 
Even if I cannot access AP configuration page, everything still works well, my clients can access the internet. One of my PC on the network can still control and monitor other PCs on the network using NetTop School Software.

Can anyone please kindly advise on this matter? Thank you very much.