Server freeze and all services do not respond

[xinet]

Hello,
I have a problem with IPSCONFIG 3.0.1.3 installed into a debian lenny release.
My problem is that periodically my server freeze and all services do not respond.

The problem is the CPU that do is completely occupied.

I've controlled every log files but I didn’t find any minacious message.

After rebooting every thing back to work fine, almost for one week.

Is it possible that some of these processes crash:
- (root) CMD (/usr/local/ispconfig/server/server.sh (start every 1 minute);
- (www-data) CMD ( test -x /usr/bin/php && /usr/bin/php -q /usr/share/horde3/scripts/alarms.php (start every 5 minutes);
- (getmail) CMD (/usr/local/bin/run-getmail.sh > /dev/null 2>> /var/log/ispconfig/cron.log) (start every 5 minutes);
- (www-data) CMD ([ -x /usr/lib/cgi-bin/awstats.pl -a -f /etc/awstats/awstats.conf -a -r /var/log/apache/acce
ss.log ] && /usr/lib/cgi-bin/awstats.pl -config=awstats -update >/dev/null) (start every 10 minutes).


Any way to solve the problem?

Thanks for any answers.