When I type the following command:

zmcontrol stop

I get this output:

Host mail.mydomain.com
Stopping stats...Terminated

Yet, if I immediately type:

zmcontrol status

I get this output:

Host mail.mydomain.com
antispam Running
antivirus Running
ldap Running
logger Running
mailbox Running
mta Running
snmp Running
spell Running
stats Running

by this error when I halt my server (shutdown -h now), the mysql.server never shutdown correctly and when the server is up sometimes the mailboxd never start, in other forum say that I can solution this error with upgrade to other version, but I have the last zimbra version: Zimbra Collaboration Suite 6.0.5GA Release under ubuntu 8.04.2 LTS 64bits

Can I "upgrade" to the same zimbra version?
Other solution for this error please?

Thanks a lot