I am having an issue where my Iris thermostat keeps reverting back to running an auto schedule.
This may be related to your issue.
If the 18.104.22.168 platform was running for you, revert to it. I had to do so because of thermostat issues with a Zen Zigbee edition thermostat.
I updated the platform, but my thermostat still attempts to run the schedule. I manually have to tap the hold icon in order for the temperature to stay set at a specific temperature. I am also running the thermostat app, and it does not stay at the predefined settings I have for the temperatures.