A couple of field tech questions:
- Do you have any mains-powered zwave devices within about 15 meters of the thermostats? How far are they from the hub?
Sometimes this is just a matter of a weak mesh: the battery powered devices are having trouble getting signal through, so they have to keep resending multiple times, and that uses up the battery
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any chance there’s something nearby that’s interfering with the signal? This can cause the same issue as point 1: the devices have to send each message multiple times to get through. Wi-Fi and Zigbee are not a problem for Z wave. Most commonly it’s old style baby monitors, cordless landline phones, but also these days, some drones, even a drone which is plugged in and charging.
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have you run a Z wave repair to see what error messages you get there?
FAQ: Zwave Repair from the ST app (June 2022)
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are they using an edge driver and if so, which one?
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have you implemented any polling? This is less common these days without groovy smart apps, but some people do have it set up through home assistant, MQTT, or Hubitat integrations.