WDMyCloud has been operating well until a few weeks ago.
One day, I plugged a USB drive to MyCloud for testing purpose as I plan to buy WD MyBook to be linked to MyCloud. I noticed the USB host became hot and a lot hotter than usual. Then I shut MyCloud down. After next reboot, I found out that connection to MyCloud broke intermittently. I first thought it was due to my WIFI. So, I used the direct connection from my PC to MyCloud. The issue still persisted.
I followed pieces of advice from all posts in this forum including downgrading firmwares (2x,3x) and running a couple of commands. None of them worked.
So, I restored back to the latest firmware which is WDMyCloud v04.05.00-320 : Core F/W as of now.
Warning: I use WDMYCloud only for storage. I use SSH/FTP for file transfer as it can resume transfer as PC resumes from sleep. Follow below advice at your own risk.
Below are the trial-and-error steps I experimented.
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Restart WDMyCloud
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Let it stable for 12 hours. I leave it for a day. (Processor-eating processes like content scanning is taking place when the device gets rebooted)
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Enable SSH through UI
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Login to SSH and reboot again after running the following commands:
killall -9 winbindd
killall -9 rcpbind
/etc/init.d/netatalk stop
update-rc.d netatalk disable
/etc/init.d/restsdk-serverd stop
update-rc.d restsdk-serverd disable
/etc/init.d/samba stop
update-rc.d samba disable
/etc/init.d/nfs-kernel-server stop
/etc/init.d/nfs-common stop
update-rc.d nfs-kernel-server disable
update-rc.d nfs-common disable
/etc/init.d/upnp_nas stop
update-rc.d upnp_nas disable
/etc/init.d/mDNSResponder stop
update-rc.dmDNSResponder disable
/etc/init.d/wdphotodbmergerd stop
/etc/init.d/wdmcserverd stop
/etc/init.d/mdadm stop
update-rc.d mdadm disable
/etc/init.d/rpcbind stop
update-rc.d rpcbind disable
update-rc.d ssh enable
update-rc.d vsftpd enable
update-rc.d apache2 enable
Good luck in saving your MyCloud! 
