redirected folder permissions not working

we have an SBS 2011 install and we are having issues where the users there are only 3 of them repeatedly loose their permissions to the my documents folders. I have rebuilt one of the systems in the last week, brought in the laptop synced all the files for offline use without any issues, took it back had the user log in and she was able to access all the files without any issues, today she can access some of the folders and files but not all of them, some top level but not sub folders and she gets an "access denied" error when trying to do so using Office 2013. Help?