hello, I got this in the event log of the ZD: "Fail to initialize the configuration of all AP because number of AP in configuration exceeds system limit". But the ZD is licensed for 6 APs and has only 3 APs connected. Have you ever meet this before?
What version of ZoneFlex are you running and what is the uptime of the ZD?
If the ZoneFlex firmware is ~8.x it's possibly a known issue with the ethernet drivers. Secondary however to something going horribly wrong on the ethernet side (such as DOS attack, broadcast storm, etc)
If you are under support, I recommend you grab the ZD Debug file, and open a support case.