I had a similar problem when adding a T300 to an existing Unleashed network running 200.2. In my case resetting the AP using the reset button worked, but you would figure that would do the same as a reset via SSH.
In your case, it might be worth ruling out any wired infrastructure issues then running a Wireshark trace to see if that gives any clues. Failing that, log a case with Ruckus.
Thanks,
Mike