Over the past several weeks, I've noticed a couple of computers have spontaneously lost their registration information, at least at the agent level. They're still listed in ZCC, but, on the agent, you get no Login/Logout option. And, in the Agent properties on the Status screen, under Device Name, Primary User, Management Zone, Server DNS, and Server Address, all I see it the word "Unknown."

I can use the ZAC command to re-register the machines. At first, I didn't think anything of it, but I started seeing one or two a week. Anyone else seeing this kind of scenario in their envirnoment?