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Since about two weeks, my root server crashes randomly at night (European/Berlin time). Not every night, just from time to time. It happened the fourth time today.

I never had problems before, and there isn't anything suspicious in the logs. One time even a technician had to go to my server and restart it manually because the automatic hard reset didn't work. Here are a few minutes before the crash happens (There's nothing else until the startup beginning at 10:01:12):

Sep 18 05:00:01 root postfix/pickup[31018]: C74269AE09DF: uid=33 from=<www-data>
Sep 18 05:00:01 root postfix/cleanup[1043]: C74269AE09DF: message-id=<20130918030001.C74269AE09DF@root.geardev.de>
Sep 18 05:00:01 root postfix/qmgr[2444]: C74269AE09DF: from=<www-data@root.geardev.de>, size=1412, nrcpt=1 (queue active)
Sep 18 05:00:01 root postfix/local[1045]: C74269AE09DF: to=<www-data@root.geardev.de>, orig_to=<www-data>, relay=local, delay=0.01, delays=0.01/0/0/0, dsn=2.0.0, status=sent (delivered to mailbox)
Sep 18 05:00:01 root postfix/qmgr[2444]: C74269AE09DF: removed
Sep 18 05:00:38 root postfix/anvil[620]: statistics: max connection rate 1/60s for (smtp:***.***.***.***) at Sep 18 04:55:18
Sep 18 05:00:38 root postfix/anvil[620]: statistics: max connection count 1 for (smtp:***.***.***.***) at Sep 18 04:55:18
Sep 18 05:00:38 root postfix/anvil[620]: statistics: max cache size 3 at Sep 18 04:56:07
Sep 18 05:00:52 root postfix/smtpd[1125]: warning: ***.***.***.***: address not listed for hostname client.yota.ru
Sep 18 05:00:52 root postfix/smtpd[1125]: connect from unknown[***.***.***.***]
Sep 18 05:00:54 root postfix/smtpd[1125]: NOQUEUE: reject: RCPT from unknown[***.***.***.***]: 450 4.7.1 Client host rejected: cannot find your hostname, [***.***.***.***]; from=<> to=<blog@50hz.de> proto=SMTP helo=<***.***.***.***>
Sep 18 05:00:54 root postfix/smtpd[1125]: lost connection after RCPT from unknown[***.***.***.***]
Sep 18 05:00:54 root postfix/smtpd[1125]: disconnect from unknown[***.***.***.***]
Sep 18 05:01:18 root postfix/smtpd[1125]: connect from dsl-emcali-***.***.***.***.emcali.net.co[***.***.***.***]
Sep 18 05:01:20 root postfix/smtpd[1125]: NOQUEUE: reject: RCPT from dsl-emcali-***.***.***.***.emcali.net.co[***.***.***.***]: 450 4.7.1 <***.***.***.***>: Helo command rejected: Host not found; from=<> to=<hans.meinen@seefelder-muehle.de> proto=SMTP helo=<***.***.***.***>
Sep 18 05:01:20 root postfix/smtpd[1125]: lost connection after RCPT from dsl-emcali-***.***.***.***.emcali.net.co[***.***.***.***]
Sep 18 05:01:20 root postfix/smtpd[1125]: disconnect from dsl-emcali-***.***.***.***.emcali.net.co[***.***.***.***]
Sep 18 05:04:40 root postfix/anvil[1127]: statistics: max connection rate 1/60s for (smtp:***.***.***.***) at Sep 18 05:00:52
Sep 18 05:04:40 root postfix/anvil[1127]: statistics: max connection count 1 for (smtp:***.***.***.***) at Sep 18 05:00:52
Sep 18 05:04:40 root postfix/anvil[1127]: statistics: max cache size 2 at Sep 18 05:01:18

But it's mostly postfix. I'm using Debian Squeeze:

# cat /proc/version
Linux version 2.6.32-5-amd64 (Debian 2.6.32-48squeeze3) (dannf@debian.org) (gcc version 4.3.5 (Debian 4.3.5-4) ) #1 SMP Fri May 10 08:43:19 UTC 2013

Might it help to upgrade the server to Wheezy?

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