I have two Flc Hub LR. Each is hardwired to an L3 switch. The Flic buttons work fine. The network locks up intermittently. Looking the the router logs, there is a network loop at these times. I can trace the network loop back to the Flic LR hubs. Disconnecting the hubs from the network solves the loopback problem. Reconnencting them to the network reliably causes the problem to re-occur.

Is there a fix for this, or are the hubs just a fail?

I have two Flic LR hubs. Ideally, like other devices, one would be able to set up both wired and wifi connections so that if something happens to the ethernet connection, the wifi connection would be active.

With the Flic Hub LR, if Wifi is configured and you plug in the ethernet, both network interfaces are active making the device look like two devices on the network and and they both take the same IP address.

Needless to say, having a duplicate IP address on the network is an issue.

The workaround, to disable the wifi interface is kind of hacky and non-preferable.