nagios service flapping

[Rahul Nabar]

I just had a bunch of  services start flapping on me. THe common factor
seems all of these were services monitored by nrpe.

//////////////
Notifications for this service are being suppressed because it was detected
as having been flapping between different states (22.4% change >= 20.0%
threshold). When the service state stabilizes and the flapping stops,
notifications will be re-enabled.
//////////////////

My nrpe.cfg is pristine except for

command[check_disk_scratch]=/usr/local/nagios/libexec/check_disk -w 20 -c 10
-p /scratch

What could be causing a service to start flapping. Never happened to me
before. ANy debug sugesstions?

The Status for the service is correct though.
DISK OK - free space: /scratch 14886 MB (52% inode=98%):

-- 
Rahul

snippet from services.cfg
define service{
        use rpn_intermediate_service
        hostgroup_name npre-compute-nodes
        service_description /scratch Partition on nodes
        check_command check_nrpe!check_disk_scratch             ; details
defined in the nrpe.conf
}
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