LAN connection fails intermittently with VR 600
I have a new Archer VR600 configured as modem and router.
All WIFI devices can connect and work properly, with expected internet speed.
But LAN connected desktop after some hours start to connect and disconnect intermittently. At same time WIFI connected devices work properly, so no internet access issue.
I noted also that at "Network Map", refreshing "Wired Clients" my desktop figures in the list and disapears, intermittently. Desktop is not in sleep mode or similar.
I followed some post related to a similar issue, and verified that my DoS protection in router is disabled.
Any idea what can be done?