OPManager 9 performance monitor stops unexpectedly

OPManager 9 performance monitor stops unexpectedly

Hello there,
I have performance monitor defined for windows server 2003, for instance Disk Utilization.
Interval in minutes = 5.
monitoring interval for that device is 5 minutes also.

that is Disk Utilization measurment history for today:
Feb-27-12     10:35     69.0
Feb-27-12     9:55     69.0
Feb-27-12     8:55     69.0
Feb-27-12     8:00     69.0
Feb-27-12     7:55     69.0
Feb-27-12     7:35     69.0
Feb-27-12     5:35     69.0
Feb-27-12     4:30     69.0

Why could it be that I have these diffrent measurment periods?
What should I check(SQL job or table) if these measurments stop at all?
















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