Received packet on lan0 with own address as source address

I have a Brume acting as WAN gateway, DHCP, OpenVPN client, etc. for a large home network.

I’m having LAN outages lasting ~2 minutes, occurring about once a day. The WAN, OpenVPN etc. stay up but all LAN activity stops - pings dropped, no traffic between any devices.

The LAN always comes back of its own accord, after which the log contains many messages as follows:

“br-lan: received packet on lan0 with own address as source address (addr:94:83:c4:00:d5:4f, vlan:0)”

That mac address is the Brume’s LAN port.

Any suggestions about how to diagnose and fix this would be very welcome !!

Cheers
Sean

Maybe the links below will help you.