The simplest solution would be to create an alert for WMI nodes that notifies you when a volume is in an unknown state for longer than "x" amount of time. Node status is determined by ICMP, no differently than SNMP managed nodes so I'm not sure how the problem you describe is unique for WMI managed nodes? These forums have plenty of threads where people are discussing similar issues when the SNMP daemon on their device stops responding. The solutions that address that issue are equally applicable in your scenario as well.
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