Backup drive ejects after TM backup

Hi
I am not sure if this has already been covered, as there are various similar posts, so please accept my appologies if it has.
I have an external 1TB WD My Passport drive which I use for TM backup's. When I plug in via USB, DriveUnlock appears. I unlock the drive, then instigate a TM backup. All goes fine, then from what I can gather, when the TM backup has finished, the drive ejects itself. There is no error messages, unmount drive issues, it just dissappears from finder. I can only assume the backup has been successful, as no error messages appear, meaning the drive wasn't ejected while backup was in progress. I have changed the USB cable, as well as tried different ports, but the same always happens. In System Preferencies/Energy Saver, I have made sure the Put HD to sleep is un ticked. Still it happens. Has anyone else had this problem, and is it fixable? I would love to keep the drive attached and backing up for the period I am working, usually 12 hours a day, rather than the once a day at the moment.
thanks

mpphoto72 wrote:
When I plug in via USB, DriveUnlock appears.
If you're using the drive with Time Machine, you don't need WD's SmartWare backup software. It may be conflicting with TM. Uninstall it.
See https://discussions.apple.com/message/15462618#15462618

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