AFAIK and (suffer) it seems there is a soft bug in the firmware:
Reset or quick factory restore trought reset point doesn’t seems to restore factory default to dhcp ip access if you change to static ip and set dns so we can’t access the device anymore after saving wrong data in this setting fields!
I solved mine under my responsability:
http://community.wd.com/t5/WD-My-Cloud/How-to-unbrick-a-totally-dead-WD-My-Cloud/m-p/632129#M2347
