My Book Essentials 2TB USB3.0 keeps unmounting

So i purchased this external driver the other week and so far havent been able to get it to work properly.

I install the software that comes with it, SES drivers, Smartware drivers etc etc. Then go to my computer, go into the driver and proceed to copy moves across from my PC, only to have the process jam, and shortly after the drive unmount and no longer be visable.

The only way i can get it visible again is to unplug it and plug it back in from the power.

Anyone else had this problem and know of a solution???

Im using Windows 7 64bit. Have checked power settings and they are fine.

Be sure to always safely eject the My Book, before disconnecting the USB cable from the PC. You can try running a test using DLG, if the test completes successfully, backup any important files and then reformat the My Book. Follow the link below for the steps.