X86 Hardware issues (Graphics, WiFi, Onboard Sound, external DACs, Disks, BIOS/UEFI Boot problems etc.)

Good evening
I have problems with the dell wyse and volumio

I have managed to connect it to a screen, as for I know it always boot at start
But
I can not reach it via GUI on the phone
At the moment it has fixed up on cable net, with reserved IP number within DHCP numbers
If I start it from stopped many times it is not reachable. If I restart it same problem.

If I start it and it is reachable I can restart it or shut it down and then on again and it works correctly.

If it remained unplugged and then I start it it can have the problem or not

The same happens if I left it with free DHCP number
Other things on my net with fixed ip or not have no net problems

Have you got any suggestion?

I am not able to get a log as it is not reachable. The browser give net error internet disconnected when I try to reach it via IP or volumiolocal. The cable is directly connected from the router and the ethernet port on the dell blinks