I won't say my z-wave network is stable to begin with. Every once in a while some devices will stop responding, only to come back after some time.
Today I woke up and found that nothing's responding. Enabled the logs on a particular dimmer and it's sending button events. But won't respond to anything from the hub. This is actually happening to everything on the network.
Button events from switches, dimmers, and remotes are being received by the hub. Commands to turn on/off and adjust levels are being sent from hub to devices. But nothing is happening.
Rebooting the hub doesn't help. Power-cycling the dimmers doesn't help. Updating to latest FW doesn't help. Nothing's working. I've fallen back to treating them as dumb switches.