Today I successfully upgraded my home firewall (Dell Optiplex 780). But after a few hours I found a problem. My internal network card Intel 82657 LM-3 suddenly stop working. After force restart I found some interesting lines in system log. It seems like ntpd have some issues with that ethernet card. Force restart solves the problem for about 3 hours, then its start all over again. I temporary changed my internal network card with intel 82544EI.
2016:05:10-16:53:53 robertox ntpd[8138]: Deleting interface #31 eth0, 192.168.2.1#123, interface stats: received=0, sent=0, dropped=0, active_time=40 secs
2016:05:10-16:53:56 robertox ntpd[8138]: Listen normally on 32 eth0 192.168.2.1:123
2016:05:10-16:53:56 robertox ntpd[8138]: new interface(s) found: waking up resolver
2016:05:10-16:55:01 robertox /usr/sbin/cron[23801]: (root) CMD ( /usr/local/bin/reporter/system-reporter.pl)
2016:05:10-16:56:05 robertox ddclient[5305]: WARNING: file /var/cache/ddclient/ddclient.cache, line 3: Invalid Value for keyword 'ip' = ''
2016:05:10-16:56:41 robertox ddclient[5305]: FAILED: Could not get freedns update URLs from freedns.afraid.org
2016:05:10-17:00:07 robertox ntpd[8138]: Deleting interface #32 eth0, 192.168.2.1#123, interface stats: received=0, sent=0, dropped=0, active_time=370 secs
2016:05:10-17:00:09 robertox ntpd[8138]: Listen normally on 33 eth0 192.168.2.1:123
2016:05:10-17:00:09 robertox ntpd[8138]: new interface(s) found: waking up resolver
2016:05:10-17:00:04 robertox /usr/sbin/cron[24314]: (root) CMD ( /var/chroot-httpd/var/webadmin/extra/httpd_session_cleanup)
2016:05:10-17:00:04 robertox /usr/sbin/cron[24320]: (root) CMD (/usr/local/bin/create_rrd_graphs.plx --mode monthly,daily)
2016:05:10-17:00:04 robertox /usr/sbin/cron[24321]: (root) CMD ( /var/chroot-http/var/sandboxd/tools/clear_cache_data.plx)
2016:05:10-17:00:04 robertox /usr/sbin/cron[24322]: (root) CMD ( /usr/local/bin/rpmdb_backup )
2016:05:10-17:00:04 robertox /usr/sbin/cron[24323]: (root) CMD ( /usr/local/bin/reporter/system-reporter.pl)
2016:05:10-17:00:04 robertox /usr/sbin/cron[24324]: (root) CMD (/var/mdw/scripts/pmx-blocklist-update)
2016:05:10-17:00:44 robertox ntpd[8138]: Deleting interface #33 eth0, 192.168.2.1#123, interface stats: received=0, sent=0, dropped=0, active_time=35 secs
2016:05:10-17:00:56 robertox ntpd[8138]: Listen normally on 34 eth0 192.168.2.1:123
2016:05:10-17:00:56 robertox ntpd[8138]: new interface(s) found: waking up resolver
2016:05:10-17:01:11 robertox postgres[3743]: [7-1] LOG: using stale statistics instead of current ones because stats collector is not responding
2016:05:10-17:01:12 robertox ntpd[8138]: Deleting interface #34 eth0, 192.168.2.1#123, interface stats: received=0, sent=0, dropped=0, active_time=17 secs
2016:05:10-17:01:15 robertox ntpd[8138]: Listen normally on 35 eth0 192.168.2.1:123
2016:05:10-17:01:15 robertox ntpd[8138]: new interface(s) found: waking up resolver
2016:05:10-20:25:43 robertox ntpd[6054]: Deleting interface #4 eth0, 192.168.2.1#123, interface stats: received=0, sent=0, dropped=0, active_time=78 secs
2016:05:10-20:25:46 robertox ntpd[6054]: Listen normally on 7 eth0 192.168.2.1:123
2016:05:10-20:25:46 robertox ntpd[6054]: new interface(s) found: waking up resolver
2016:05:10-20:27:11 robertox ntpd[6054]: Deleting interface #7 eth0, 192.168.2.1#123, interface stats: received=0, sent=0, dropped=0, active_time=85 secs
2016:05:10-20:27:15 robertox ntpd[6054]: Listen normally on 8 eth0 192.168.2.1:123
2016:05:10-20:27:15 robertox ntpd[6054]: new interface(s) found: waking up resolver
2016:05:10-20:28:24 robertox ntpd[6054]: Deleting interface #8 eth0, 192.168.2.1#123, interface stats: received=0, sent=0, dropped=0, active_time=69 secs
2016:05:10-20:29:11 robertox ntpd[6054]: Listen normally on 9 eth1 192.168.2.1:123
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