samba - Mar 2016 - Problem with Notepad ++

Good day to everybody,

I have a problem with Notepad ++, but it is not related only to this editor.

Since my upgrade from Debian 7 to 8 (Jessie), and upgrade from Samba 3 to Samba
4, I have a new problem. When I work on a file from a windows computer on a
remote samba server, notepad ++ sometimes detect that the file as changed, but
this is not true. As someone already seen this problem ?

Thank you and regards
Philippe RITTER

My conf :
[global]
        workgroup = CDM
        netbios name = mumm
        security = ADS
        realm = CDM.SMIS.CH
        socket options = TCP_NODELAY

        server string = Mumm Samba Server
        map to guest = Bad Uid
        map archive = no
        log file = /var/log/samba/%m.log
        log level = 2
        max log size = 10000

        local master = No
        read only = No
        preferred master = no
        short preserve case = No
        dos filetime resolution = Yes

        dedicated keytab file = /etc/krb5.keytab
        ##kerberos method = secrets and keytab
        kerberos method = secrets

        idmap config * : backend = tdb
        idmap config * : range = 100000-299999
        idmap config CDM : backend = rid
        idmap config CDM : range = 10000-99999

        winbind trusted domains only = no
        winbind use default domain = yes
        winbind enum users  = yes
        winbind enum groups = yes
        winbind refresh tickets = yes
        winbind offline logon = no
        template shell = /bin/bash
        template homedir = /home/%U