Ran across a very similar issue as the one described in TL-WA850RE flooding the network with ARP frames - Home Network Community

Our TL-WA850RE is being used in local Fritz-Box network in Repeater-Mode and continuously emits a large amount of ARP frames.

I was able to record this via Wireshark, the repeater in this case is 192.168.178.2:

In some instances, the requested IP addresses belong to devices on the local network, in other instances not.

I have tried various settings on the repeater, including setting static IP address or explicitly disabling Smart DHCP.

Has there been any update on this since the original issue was posted?