Excel 2013 set all file readonly for user on network drive

I have a NAS. I created a directory (and make a network drive) with owner Domain Users, User Domain Users with full access rigths. After I open an excel file with Office 2013 or Office 2010 and close it without saving, all file on the NAS seems to be read only for the current user. If restart the computer, sacurity of file readonly unchecked again. If I open the file with other program (LibreOffice), there is no problem. If add Everyone with full righhts to the users list, then it is work, but it is not enough secure in windows domain.