[Samba] Samba AD member lost domain join after reboot

[Alexis RIES]

Hello,

After each reboot, my Samba AD member server lost domain join after 
reboot, I have to re-enter the server in the domain with the "net ads 
join -U administrator".

I use version 4.4.3 of samba.
The domain controller is a Samba AD server.

After reboot, when I exectute "net ads testjoin" I have:
kerberos_kinit_password SMB2$@AD.SAMDOM.LOCAL failed: failed 
Preauthentication
kerberos_kinit_password SMB2$@AD.SAMDOM.LOCAL failed: failed 
Preauthentication
Join to domain is not valid: Logon failure

And when I execute "wbinfo -t":
checking the trust secret for domain SAMDOM via RPC calls failed
wbcCheckTrustCredentials (SAMDOM): error code Was 
NT_STATUS_USER_SESSION_DELETED (0xc0000203)
failed to call wbcCheckTrustCredentials: WBC_ERR_AUTH_ERROR
Could not check secret

Anyone know this problem?
How can I make the domain-join to persist reboots?