Nagiosgraph - No 'performance data' when increasing 'normal_check_interval' time

When i increase “normal_check_interval” value from default(10min.) to 15min. or greater for any service, nagios stops receiving performance data in .rrd files.

I also checked it with increasing “perfdata_timeout” value but it didn’t work.

Details are:
Nagios version: Nagios Core 3.5.0 or 3.2.3
plugin version: nagios-plugins-1.4.16
Nagiosgraph version: nagiosgraph-1.4.4
OS: Redhat 5.8 64bit

Service configuration:
define service{
use generic-service
host_name Server-10
service_description Disk-Boot Partition Free Space
check_command check_nrpe!check_disk_boot_partition
normal_check_interval 30
}

PS: Services with default “normal_check_interval” value, giving perfdata continually.

Any help would be appreciated.

Thanks,