As RayBe said, the log messages you posted are only informational, and can be disregarded in cases like this.
The Aeon stick can be a bit difficult, and there are a few reports around the net that it can lock up and require a power-cycle to bring back (unplug and replug the stick will do). I have also experienced this. This problem seem to happen on other zwave stacks beside OpenZWave also.
I'm not concluding that this is your problem, but if things lock up, please try to unplug it and replug the stick.
If you have communications problem where a node is considered dead, you should use the new Advanced ZWave page (under Automation in the web-admin) to troubleshoot the issue.
See the wiki page for more information about it.
If a node is dead, the node will have a red color in that page. To bring back a single dead node, use the "Test node" command on the node.