When Samba looses the connection to the MySQL database server the connection is not reestablished which guides to broken authentication.
Since this happens (i think not only for me) every night when MySQL is restarted by logrotate this issue should be fixed soon.
Working on this; seems like cache issue, but new to the code. Sorry if it takes me a little while.
Are you getting forward?
See bug 3375. If someone wants to maintain these modules outside
the Samba source tree, that is fine. But the source has been removed
from the upcoming 3.0.22 release.