Hi I have four thermostatic valves KH100 connected to hub KH100 (hardware v1.0, firmware w1.6.2), all firmware and app updated. Plus three temperature sensors and a window-open sensor. App v 3.4.451 on android v16.  In a typical week in winter data usage is between 150MB/week and (!) 1.97 GB/week. What's wrong with it?

Any clue appreciated