I encountered the same issue a few months back after upgrading to v200.2.9.13.186. I logged a support case for it and was advised that it might be fixed in a future release, but in the meantime it could be worked around by using a static IP. Here's a thread on the subject:
https://forums.ruckuswireless.com/ruckuswireless/topics/power-status-led-continually-flashes-on-mast...