OCS Agent (for Windows), after install, is a service. So Agent start running with Windows up to you close Windows, and it try to connect to server 3 times a day (if computer run ~8-10 hours a day).
Usually it sent inventory each 24 hours (PROLOG_FREQ).
I'm not sure there is someting about Network Adapters change : if yours adapters changes something it could be accurate to have inventory adjusted, no ?