I’m sure that’s very frustrating. There are a couple of different things that could cause this. If you have one bad zwave device, it could be flooding the network. That’s most commonly the device most recently added. It could also be that a critical repeater has gone down.
There’s also a completely separate issue which is been affecting a number of members which just started in the last few weeks and appears to have to do with the new health check feature that was added.
Definitely report it to support. They may be able to see something from their side.
It might be related to the following more widespread issue:
There are a couple of different things that could cause this. If you have one bad zwave device, it could be flooding the network. That’s most commonly the device most recently added. It could also be that a critical repeater has gone down.