MaxCube not working properly anymore

Is the ELV MaxCube and radiator thermostats still working properly for anyone?

I am having the following issue:
Besides that, in case HA succeeds to change the temperature, it looks like the temperature of all thermostats is changed.

Since some weeks I have exactly the same behavior. A change in the livingroom changes the thermostat in childroom too. But not the way around and also the bedrooms thermostat isn’t changed.

I’m really angry because the system isn’t reliable any longer.

I reconfigured everything multiple times but it won’t work :frowning:

How did you resolve your problem?