I am using Openwrt on flashed TPLink Archer C20's, not ideal or mesh, but they work reliably and support many devices. I have a lot of home automation devices so need decent wifi. (or at least stable...

You can see the error if you run "ipconfig /renew" before you are reconnected to Wifi. Then the Windows arp probe gives address in use error. It is probably due to an incorrect reply to the arp...

@DimiFox This is a known limitation of the Deco's if the WAN connection stops the whole device goes offline, searching for the WAN signal ie No LAN connectivity, no DHCP No dns etc. - brain dead, but...

@yves_b It happens on every DHCP query so the DHCP allocation takes a few minutes to resolve to a new address... Which in my case is the same address. As I use DHCP reservations,

I had this error (DHCP Address in use ...) on my Windows machines this command disables the ARP check and DHCP address lookup is much faster Set-NetIPInterface -InterfaceAlias "Ethernet Laptop"...