From what I can tell, v4 of the firmware has totally screwed the connectivity to my MyCloud. Transfers are brutally slow and I can’t access the administration via a browser ( http://10.0.1.9/UI/)) … hangs with “initiallizing device.” I can’t access my MyCloud using the WD MyCloud software either … “can’t connect to this device.”
There are apparenly two options:
Back up, then do a factory erase and start again with the new firmware.
Use firmware rollback instructions found on this forum.
There seems to be something that goes wrong with the update on a number of devices. Nobody has nailed down what, but a rollback or a full factory erase seem to clear up the issue.
I have created a thread on how to downgrade to previous version. You can check it @ http://community.wd.com/t5/WD-My-Cloud/Easy-method-to-downgrade-to-previous-version-of-the-firmware/td-p/773073