nothing wrong with the network cable/network that I connect to the t95z I have an alfawise h96pro that I have tested on the same cable/port and that works fine with full gigabit speeds (tested with file TX and Iperf shows over 900mbps)

i'm not so sure on that, on the android rom that it came with I had no problems with file transfers and gigabit connections?.

If it helps I can open the unit up and take some photos of the board?

Attached "gxm_q201_2g_1gbit_nocal.zip" did not work for my t95z plus 2/16 and LibreELEC 8.2 for S912 -> no LAN connection

So whats wrong in my setup?

Thank you, just tried it in CoreELEC but it is also not working, only for the first
few minutes

That's the same problem I have. It works but only for a few minutes.

I'm wondering if there still this problem as I'm considering buying a secondary box. Have someone tried it with the latest version of Armbian? Menion have you checked out if there is still the issue with kernel 4.19?

Quote from Menion

I have not found yet the time to bring a 4.19 to a boot on my S912 devices. When I tried the 4.18 Ethernet was just down. Can you give a shot with CoreELEC? There are people there confirming that they solved the issue

I don't have a S912 device yet, I'm afraid. I was just considering to buy it and checking if it was working.