nyinyihan wrote

All EAP225 outdoors were disconnected from oc 200. I try to solve this issue. But finally I have reset all devices. I want to know how can slove this issue without resetting my devices. Can I face this issue always? I am using omada app in my smart phone. 

Unless you find out what causes the loss of network connectivity, you cannot take any action to avoid this in the future.

A factory RESET is not considered a bug fix.

The fact that all EAPs – even the wired mesh root node – had been disconnected from the controller is a clear indication of a glitch in your network rather than something related to Omada controller or to EAPs.

It could be a controller just being started when the laptop running it exits hibernation mode, it can be caused by a changing IP address for the EAPs during DHCP lease renewal b/c of a reboot of the router or DHCP server or it can be a defective cable.

I recommend to use static IP addresses for all stationary devices including EAPs. You can either set static IPs in Omada controller or use the MAC-IP mapping in the DHCP server to achieve this. Also make sure the controller is running all the time and EAPs can reach the controller.

If the EAPs disconnect again, try to find out what was the cause for the issue with failed network connectivity.