This is a well known problem that has been discussed in numerous other threads and posts. The workaround is explained in the following post:
http://community.wd.com/t/new-release-firmware-release-04-04-02-105-1-27-2016/148441/69
The solution is to remove all but the latest USB Share name entry and then rename to remove the “_x” numbering.
Other threads where this issue has been discussed.
http://community.wd.com/t/usb-drive-makes-new-name/152675/
http://community.wd.com/t/dublicate-shares-after-reboot/153348/
http://community.wd.com/t/my-cloud-2tb-doesnot-recognise-safepoint-for-updation/153485/
http://community.wd.com/t/my-cloud-2tb-doesnot-recognise-safepoint-for-updation/153485/
http://community.wd.com/t/missing-safepoint-after-firmware-update-ver04-04-02-105-2016-jan/149031/
