[Dovecot] Help, the dovecot ldap is down !

Hi ! my dovecot server is down, the users don't can make login.

In a sometimes the dovecot log show the message bellow

Aug 17 08:35:46 xxxxx dovecot-auth: nss_ldap: reconnected to LDAP server ldap://127.0.0.1 after 1 attempt

In other times show

Aug 17 09:40:46 xxxxx dovecot-auth: nss_ldap: reconnected to LDAP server ldap://127.0.0.1 after 5 attempts

In another times too

Aug 17 10:12:02 xxxxx dovecot-auth: nss_ldap: reconnected to LDAP server ldap://127.0.0.1 after 1 attempt Aug 17 10:12:25 xxxxx last message repeated 3 times

Somepeople can help me ?

Thanks !