Zwave SRT-321 thermostat not always setting

I've been struggling with this thermostat for some time.

Sometimes my thermostat scheduler app manages to set it, sometimes it doesn't. Annoying to get up to a freezing house this morning and equally annoying to be in bed with the heating still whirring at night.

The SRT-321 is battery powered and only wakes every 1200 seconds but this shouldn't be a problem should it? Shouldn't Hubitat keep trying to set it until it works?

Am running a H7 on 2.3.9.193

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You can see in this log for the device (its called "thermo4"):

dev:512024-11-21 07:18:58.525infoThermo4 Current SetPoint is 20.0 Current Temperature is 15.7 - Calling for Heat
dev:512024-11-21 07:15:00.097infoThermo4 Current SetPoint is 10.0 Current Temperature is 15.7 - Heat not needed
dev:512024-11-21 07:00:00.128infoThermo4 Current SetPoint is 10.0 Current Temperature is 15.7 - Heat not needed
dev:512024-11-21 06:59:09.845infoThermo4 Current SetPoint is 10.0 Current Temperature is 15.7 - Heat not needed
dev:512024-11-21 06:59:08.336infoThermo4 Current SetPoint is 10.0 Current Temperature is 15.7 - Heat not needed
dev:512024-11-21 06:59:08.331infoReport Received : Sensor MultiLevel Report
dev:512024-11-21 06:59:02.214infoThermo4 woke up - Current Temperature is 15.7 - Setpoint is 10.0 - Mode is auto - Operating State is idle - Battery is 54
dev:512024-11-21 06:52:32.200infoThermo4 Current SetPoint is 10.0 Current Temperature is 15.7 - Heat not needed
dev:512024-11-21 06:52:32.195infoReport Received : Sensor MultiLevel Report
dev:512024-11-21 06:45:00.092infoThermo4 Current SetPoint is 10.0 Current Temperature is 15.8 - Heat not needed
dev:512024-11-21 06:39:04.905infoThermo4 Current SetPoint is 10.0 Current Temperature is 15.8 - Heat not needed
dev:512024-11-21 06:39:03.448infoThermo4 Current SetPoint is 10.0 Current Temperature is 15.8 - Heat not needed
dev:512024-11-21 06:39:03.441infoReport Received : Sensor MultiLevel Report
dev:512024-11-21 06:38:57.145infoThermo4 woke up - Current Temperature is 15.9 - Setpoint is 10.0 - Mode is auto - Operating State is idle - Battery is 54
dev:512024-11-21 06:30:00.491infoThermo4 Current SetPoint is 10.0 Current Temperature is 15.9 - Heat not needed
dev:512024-11-21 06:30:00.329infoThermo4 Current SetPoint is 20.0 Current Temperature is 15.9 - Calling for Heat
dev:512024-11-21 06:19:00.646infoThermo4 Current SetPoint is 10.0 Current Temperature is 15.9 - Heat not needed
dev:512024-11-21 06:18:59.141infoThermo4 Current SetPoint is 10.0 Current Temperature is 15.9 - Heat not needed

At 0630 the Scheduler sets the temperature to 20 degress.... but you can see the thermostat keep reporting that its setpoint is 10 degrees.... until at 0718 I get up and set it manually by twiddling the dial!

I have no idea why its doing this. It doesn't happen always, just sometimes.