It's very common for DNS to be inaccurate in a dynamic DHCP environment, for a lot of reasons that probably aren't worth troubleshooting here. The quick answer is to go to Configure > Agent Discovery Options and either move DNS down in priority or turn it off; this is assuming you haven't turned off the "scan on ip address change" option in the agent.
As far as keeping the inventory service alive, that's what ldms_status is for: http://www.droppedpackets.org/scripts/ldms_status
We (I) don't have the "scan on ip address change" method. We have:
Domain Name Service (DNS)
which I have listed in the same order they are listed in the Agent Discovery Options window. ( And they are both checked. )
In fact, these are the only two visible. Do I even have the "scan on ip address change" method? How do I know? How do I add it? I went into help, but it didn't even mention the "scan on ip address change" method.
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Scan On Ip Address change is specified as part of the Agent configuration, and is not under the Agent Discovery options. Start by unselecting DNS in the agent discovery choices and see if that helps , and then go into your Agent configuration options and check under the Inventory options to see what your options are setup for there.