Alerts from antivirus software about bad arp packets. That would be kind of expected but why it does this even with most of the feature disabled is unclear. All is should need to do is log traffic like Wireshark and only need arp spoofing to try and stop traffic. Same with DNS.
Despite claims it works with Unifi it seems to have caused all kinds of issues with APs and switches not getting heartbeats to the controller and generally dropping data so the topology map was only showing a few devices and those all connected directly to the router. The client listing would often show the wrong AP/Port for a device.
Some security cams started having issues staying connected too. I'm to the point this morning I'm shutting it down so we'll see if the camera issues correct or were a coincidence.
So if you are looking for something simple to monitor your home network of a few devices and the ISP provided router this might work well for you. If your network is at all advanced beyond basic, give it a pass.