i've an orange pi one and i'm running armbian stretch (mainline) on it after issuing shutdown -h now as root, the green status indicator light goes off. but i noted that the ethernet leds remain on i leave the board powered on after shutdown but since i've already issued shutdown, i assumed that the cpu has stopped while i go on to work on my pc.   some minutes later, i accidentally touch parts of the board and it is extremely hot, every part of the board i'd say it is p