The washing machine REALLY liked talking to... itself? I don't think whoever engineered their networking stack knew what a loopback interface was, because it was sending a lot of traffic from itself to its own IP address. I didn't think this was relevant, so I ignored it. It really liked sending traffic to 255.255.255.255 every second, for some reason. Again, ignored
Are those gratuitous ARPs? This is a common behaviour.