@Matrp After factory reset and update, I cut the power to the router (breaker shutoff). Sadly, the problem persisted any idea ?

@Tony I absolutely understand and agree that UPS is as great way to prevent power failure. Nevertheless, it doesn't explain the repetitive lost of wireless configuration.

Anyone has an idea why this problem occurs. I know we should put devices on UPS, but this behavior is not normal, UPS or not.

@Tavocampana did you figure it out ?

The router works perfectly for all wired connections but the wireless are unchecked in the config after power failure. I need to log in and check them. SSID name and password is saved so it's not a...