My ZoneFlex 7363 has suddenly started to reboot very often

[peter_dahlsten]

I have been running a single ZF 7363 in standalone mode for 4 years without problems. I have hardly restarted it at all in 4 years. It runs one 2.4 GHz net and one 5.0.
A few days ago it started to drop connections, both for laptops and mobile phones. As the power led turns orange it seems the reason is that it reboots.

Today I took it off the net, did a factor reset and connected it directly to a laptop to do a new initial configuration. It works fine connecting to the console using a browser. I can change general config but as soon as I enable a wireless network and press "update settings" it reboots, power led turns orange. After that it will go into a cycle with power led becoming green then orange about every 10 seconds. It does not stay up long enough for the laptop to connect to it with the cable so I cant log into the console. I have tried factory reset multiple times but the result is the same. As soon as I configure wireless it becomes impossible to communicate with it. 

It seems the log available in the console is reset when I do the factory reset. Is there any way to access the log entries from before the factory reset to understand why it reboots when the wireless is enabled?

Any other ideas about how I can troubleshoot the issue?