v04.01.03-421 firmware is flaky

[cpt_paranoia]

Old versions of firmware are available for download and manual install from WD’s website.  Here’s the image you’re looking for:

http://download.wdc.com/nas/sq-040001-623-20140904.deb.zip

For downgrade process, see the recent thread:

http://community.wd.com/t5/WD-My-Cloud/Easy-method-to-downgrade-to-previous-version-of-the-firmware/td-p/773073