WD Security Auto Unlock won't work

I activated Auto Unlock for this user, but it won’t work. Once I log in, it works fine for a while and it log off after for several hours automatically. What should I do?
Thanks in advance.

Hi Jin,

Did you check after disabling the WD Security And set it again to configure WD Security?

Hi, Brandon.
I am sorry, but I don’t get it. How to disable the WD security and how to configure it?

Connect your hard drive that you want to remove or disable WD Security. Double click on WD Security and and a box for ““Edit Security Setting” will pop-up. There is an option for " Remove Password”, if it is not already selected, select it. Put in your password and click “Update Security Setting.”

I did it several times already, but no luck.