Did 2.4G and 5G frequency on EAP225 both disappear at the same time? I have the same issue on my EAP220 2.4G when the channel was 6.7.8.9, so I fixed it at 1. Now the EAP has been stable for about 2 days.

Do you fix it or not?

Did you ever fix this problem? I'm having sort of the same issue and it's driving me crazy. Initially the WIFI dissapeared the next day (not always 12 hours). But now, the device stops working completely after only a few minutes. And when I power-cycle the device, it doesn't come back up. I have to keep the device off the power for some time (hours). After that, I can reconnect and the device boots up correctly. The settings are kept, but it goes offline after a few minutes of uptime.

On my device, the green led is also lit when the device goes offline.This is strange, because my configuration disabled it during normal operation.

Have you tried to update the firmware? What's the product and the hardware version with it? How's your network like?