User accounts do not work

I do not consider this device horrible. It works for the most part. It is HOWEVER that, When I set a user account with a password, I can use it for a few hours but not longer. Then I reset the password and the same happens. You may or may not need this functions on this page, but IMO, if you sell a NAS you need to have that functions on working. It is really not an option, Especially not if it's a WD. The operating system I use is Windows. 7

Addendum
Since today I cant access any data anymore. My logon credentials, even for the public folder, do not work anymore and I cant contact the NAS via the browser (to change them or see whats up). I may update this if I ever find out why or how to fix That is it, but for now Im just sorry I cant give less than one star.

Second Addendum
Now the public folder is accessible at random all non-public folders are gone completely Call, nothing like getting around to finally doing your income tax and then not being able to access any file. So Access via the internet is incredibly slow (far below the connection capabilities Single Digit kb) and the Web Interface Seems outdated. So the UI is now unreachable. It is impossible to change any THEREFORE setting. A few months in and I totally hate this Device.