Problem Outlook 2013 frequent contacts lost daily

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I have a user whom at the end of each day, any frequent contacts she has sent an e-mail to are lost. Using Outlook 2013. It's only affecting this one user as far as I can tell at the moment.

Now, from what I believe to be true is that frequent contacts store within the .nk2 file. I know that this user does not have a temporary profile, although she does have a roaming profile but then again, so does everyone here.

The .nk2 file is nowhere to be found within her profile, yet whilst logged on it will start to remember frequent contacts and then after logging off and back on, it forgets them all.

I did have a look around Google and tried a few things myself like clearing locally cached profiles, deleting the Outlook folder within \roaming\microsoft but this hasn't made any difference. I have created a new mail profile on the PC, and I have tried "outlook.exe /importnk2" but this has made no difference.

Can anyone help me with this one?

Thanks