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

Hi.
Volumio3.874 instaled on wyse 3040 x86. Wifi connected to router but not joinable. I can open webgui over wifi only when I conect LAN for 5 sec. I can disconnect LAN and connection is stable - internet radio is working. After reboot - same procedure is needed. Funny thing same procedure works when connecting volumio to my iphone hotspot - volumio need LAN for few sec. /diferent nettwork/ and its working via iphone hotspot. Any idea how to fix it?