Smart Thermostat disconnects multiple times a day - works again when I pull batteries

Wierd problem on one of my Tado systems:

Several times a day/night the Smart thermostat becomes disconnected from the system.

The bridge is fine and stays connected all the time.


This means we are constantly waking up in baking conditions as the boiler runs on full blast all night.

I will add my complaint to the many existing complaints, that the tado system should failsafe against this

as it could be dangerous, but I understand that Tado do not listen to complaints or add new features.


Sometimes the Smart thermostat reconnects after a few minutes.

I can reliably force it to reconnect by removing the batteries and reinserting them.


The Bridge is working fine, my internet connection is perfect, the batteries are new -

I can't work out what's wrong - has anyone experienced similar?

Firmware for this Smart Thermostat is: V85.1


I have another Tado system that is working OK - the firmware on that Smart Thermostat is: V54.2

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