[Dovecot] Dovecot sometimes Down !

[kleiton at pcs.com.br]

Please, my dovecot sometimes down !

Aug 17 14:20:01 netrasun dovecot: pop3-login: Can't connect to auth server
at default: Resource temporarily unavailable
Aug 17 14:20:02 netrasun last message repeated 3 times
Aug 17 14:20:03 netrasun dovecot: pop3-login: Disconnected: Inactivity:
rip=157.86.6.55, lip=157.86.6.55
Aug 17 14:20:04 netrasun dovecot: pop3-login: Can't connect to auth server
at default: Resource temporarily unavailable
Aug 17 14:20:16 netrasun last message repeated 19 times
Aug 17 14:20:16 netrasun dovecot: pop3-login: Disconnected: Inactivity:
rip=157.86.6.55, lip=157.86.6.55
Aug 17 14:20:16 netrasun dovecot: pop3-login: Can't connect to auth server
at default: Resource temporarily unavailable
Aug 17 14:20:21 netrasun last message repeated 6 times
Aug 17 14:20:21 netrasun dovecot: pop3-login: Disconnected: Inactivity:
rip=157.86.6.55, lip=157.86.6.55
Aug 17 14:20:21 netrasun dovecot: pop3-login: Can't connect to auth server
at default: Resource temporarily unavailable
Aug 17 14:20:24 netrasun last message repeated 4 times
Aug 17 14:20:25 netrasun dovecot: pop3-login: Disconnected: Inactivity:
rip=157.86.6.55, lip=157.86.6.55
Aug 17 14:20:25 netrasun dovecot: pop3-login: Can't connect to auth server
at default: Resource temporarily unavailable
Aug 17 14:20:38 netrasun last message repeated 13 times
Aug 17 14:20:39 netrasun dovecot: pop3-login: Disconnected: Inactivity:
rip=157.86.6.55, lip=157.86.6.55
Aug 17 14:20:39 netrasun dovecot: pop3-login: Can't connect to auth server
at default: Resource temporarily unavailable
Aug 17 14:20:47 netrasun last message repeated 9 times
Aug 17 14:20:48 netrasun dovecot: pop3-login: Disconnected: Inactivity:
rip=157.86.6.55, lip=157.86.6.55
Aug 17 14:20:49 netrasun dovecot: pop3-login: Can't connect to auth server
at default: Resource temporarily unavailable
Aug 17 14:20:57 netrasun last message repeated 7 times
Aug 17 14:20:58 netrasun dovecot: pop3-login: Disconnected: Inactivity:
rip=157.86.6.55, lip=157.86.6.55
Aug 17 14:21:00 netrasun dovecot: pop3-login: Can't connect to auth server
at default: Resource temporarily unavailable
Aug 17 14:21:08 netrasun last message repeated 7 times

Please, Help-me !