This is a known issue with the IBM Common and Platform Windows agents. They stop responding to SNMP queries after some undefined period of time. The only known resolution is to restart the SNMP Service on the monitored server. Alternatively you can change the polling method for these servers in Orion from SNMP to WMI which does not suffer from this bug. I recommend contacting IBM support to report this issue. They may be able to provide you with a hotfix that addresses it. I suggest having at least two servers in this broken state before calling, should you need to prove to them that indeed it is broken. This will allow you still have one in this "broken" state after you've proven to them that restarting the SNMP service resolves the issue on one of the two servers.
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