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What are possible reasons for erratic NTP synchronistation?

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http://unix.stackexchange.com – On a Ubuntu 10.04 system I noticed following strange NTP sync events: Jul 3 02:19:51 hst ntpd[1432]: no servers reachable Jul 3 02:36:55 hst ntpd[1432]: synchronized to 91.189.94.4, stratum 2 Jul 3 02:53:48 hst ntpd[1432]: time reset -10.407942 s Jul 3 02:53:48 hst ntpd[1432]: kernel time sync status change 6001 Jul 3 02:53:48 hst dovecot: dovecot: Fatal: Time just moved backwards by 10 seconds. This might cause a lot of problems, so I'll just kill myself now. http://wiki.dovecot.org/TimeMovedBackwards Jul 3 02:58:37 hst ntpd[1432]: synchronized to 91.189.94.4, stratum 2 Jul 3 02:58:37 (HowTos)