After fresh Armbian isntallation is board sometimes disconnecting form Ethernet. And only complete restart helped without access to console. I applied following to try to avoid id: * Use passive heat-sink (~60°C) with some fan (~30°C) * Use proper power supply 5V/2A * Reinstall network-mamnager

 <code>
 sudo apt-get purge network-manager
 sudo apt-get update
 sudo apt-get upgrade
 sudo apt-get install network-manager
 </code>