Here also, disconnected every morning
Probably it’s the API Athom uses for tado 
I’ve no issues with the tadoZones app @ Homey Pro 2019.
You can install it next to the tado app to test if you like.
Also tado cloud has no issues as it seems:
Same here, both with tado app and with tado zones app. I built in errorhandling which restarts the app, waits a minute and tries again as soon as the tado commmand doesn’t work. This helps for now.
Alteady issued a bug-report some weeks ago at Athom but no response yet.
This issue should be fixed in version 1.1.5
See the changelog tado° | Homey
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The Tado app gives a 409 error when the thermostat is changed thru a flow. Did maintenance on the connected device, but it didn’t fix it.
Moved to new created central topic for the Athom tado app.
Error went away after 2 weeks. Weird
