Dulfaen

I have the same problem on an OrangePi One (H3) with Armbian_20.02.0-rc0_Orangepione_bionic_current_5.4.12. I changed the board, the SD-card and the patch cord, but not the power-supply. I also tried the last archived legacy Image for the OrangePi One. I always got the same problem. I fiddled around with ethtool and found that turning off the auto-negotiation for the ethernet-connection fixed it for me. I don't know whats going on in the background. As I understand it,  depending on the other side of the connection the connection could end as 10 Mbps half duplex if the auto-negotiation is turned off. But in my case (Fritzbox) the connection is rock-solid and the speed is also good. So maybe this solution that i found in some forum helps you too:
 

I have the same problem on an OrangePi One (H3) with Armbian_20.02.0-rc0_Orangepione_bionic_current_5.4.12. I changed the board, the SD-card and the patch cord, but not the power-supply. I also tried the last archived legacy Image for the OrangePi One. I always got the same problem. I fiddled around with ethtool and found that turning off the auto-negotiation for the ethernet-connection fixed it for me. I don't know whats going on in the background. As I understand it,  depending on the other side of the connection the connection could end as 10 Mbps half duplex if the auto-negotiation is turned off. But in my case (Fritzbox) the connection is rock-solid and the speed is also good. So maybe this solution that i found in some forum helps you too: