Not sure if this is the right place to post this, but...
I just bought 10 Orange Pi 3 and none has a regular functioning ethernet. The LEDs go on as expected, the graphic network setup tool shows a DHCP address for a second (or even less) then it goes away, along with the LEDs. After a few seconds, the cycle comes on again and again.
Do I have a bad lot? I've tried almost all available images, including the android that came in the ESSD memory, they all had the same behaviour.