I have a problem with some perseverative (about every 60sec) java process which produce temporary high cpu load. (zcs-5.0.5_GA_2201.UBUNTU8.FRANKLIN on ubuntu hardy 8.04 Celeron(R) CPU 2.00GHz/1,5GB RAM)

97.5% /opt/zimbra/java/bin/java -XX:ErrorFile=/opt/zimbra/log -client -Xmx256m -Dzimbra.home=/opt/zimbra -Djava.library.path=/opt/zimbra/lib -Djava.ext.dirs=/opt/zimbra/java/jre/lib/ext:/opt/zimbra/lib/jars:/opt/zimbra/lib/ext:/opt/zimbra/lib/ext/clamscanner com.zimbra.cs.account.ProvUtil -l garpu
has someone any ideas?

first i tried to upgrade to zcs-5.0.6_GA_2314.UBUNTU8.FRANKLIN to see if its better, but it has not worked and i made a rollback.
i also had problems with my symbolic link which is not supported -> Bug 14725 - Installer fails to follow and destroyes symbolic links