zabbix server doesn´t get values in a timeframe

[zychonatic]

hi,

i´m using zabbix server 1.4.4 and agent 1.4.6 on solaris.

periodly every hour, the zabbix server doesn´t receive some values from several agents for 10 min.
the values are always the same, the timeframe is always the same
the checks are agent checks and snmp checks
in this timeframe i receive all values except from these checks

any ideas what it could be?

br zychonatic