Problem in Opmanager 7

Problem in Opmanager 7

I m facing problem in Op manager.Opmanager shows proper stats when initilly discover and configure devices, but Whenever my PC restarts (on Which Opmanager service is running) due to power failure or some other reason, It failed to get SNMP stats from few devices.It starts showing partial stats for few devices i.e if showing CPU utilization , then unable to show memory utilization.From few devices it is getting full stats.from few devices it is getting no stats.However i have checked that SNMP is properly working on that device and other MIB browsers show proper results.However when i query from Opmanager it does not respond.Can any body tell me why this software is behaving in this strange way.

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