Hello @joaobelele 

Sorry for the late reply, can you help describe how the LED change when powerline adapter reboot itself, was there any firmware update failure or thunderstorm/ power outage before this happen? 

• Try a factory reset the unit and repair 2 devices

Reset Wireless powerline unit: 
Press and hold the Reset button (or use a pin to press reset hole) until all LEDs turn off and start on again.          

• Try a different wall outlet make sure its not poor or loose contact
• Update device firmware, which you've done

If still the same concern persists, and device has been working for a long time, it is recommended to contact retailer or local support to check device warranty.