ZD 1100 random crash
since some time (and i think it has been quite a long time) i have a ZD1100 randomly crashing.
To be honest, 2 ZD died in a row on this site, gone to RMA. So i'm running on a spare one, kept the old config, and i observe the same crashes, so its doesn't look hardware related.
The ZD1100 is running the latest available firwmare, and controls 16 R500.
The configuration is really quite simple, no Vlans, not even client isolation, this is basic non authentifcated wifi access (i have a separate captive portal applicance that manages user access).
So randomly (twice a day sometimes, then nothing during 1 month) it crashes : at first customers can't connect to the network, then the SSID disaprears. And lastly the ZD isn't even reachable.
A simple reboot solves the issue, but i can't figure why. Simple logs does not show anything.
At first i thought it could be my captive portal, maybe running out of available ips of whatever, but rebooting the captive portal appliance doesn't solve anything, while rebooting the ZD makes the issue disapear...
I have dozens of other installations, not a single issue like that!
Logs don't show any warning at first sight...
Any idea where i could dig to find a solution?
ps : sorry for my probably bad english!