Good to hear how long your AP was working, not sure what might give it that kind of problem.
This might be a good time to try a firmware upgrade. Standalone version 100.1.0.0.432 is in
this .zip from the Support site.
https://support.ruckuswireless.com/software/838-standalone-ap-software-100-1-0-0-432-indoor-aps If you directly connect a 192.168.0.10 pre-configured IP address laptop to your AP (192.168.0.1),
press/hold the indented Factory Default button for 8+ seconds before release. When you get
pings back from 192.168.0.1, open a browser, login with 'super', 'sp-admin' credentials from
from Maintenance::Upgrade, choose the Local method and upgrade. Reboot if the AP doesn't
reboot for you when it's done.
I'd try accessing the AP after the upgrade and define/enable SSIDs again. If you still have a problem,
you may need a hardware RMA.