@Wayne-TP 

At the beginning of the week, I connected KE100 again and a new software update appeared. This stage always passed before the device showed that it was going offline. The new software seems to have fixed the problem. 

Thank you all for your help. Now it's time to test automation with the T315

  @WyczynowyBanan 

Unfortunately, a new problem has appeared - when trying to pair the KASA and TAPO accounts, the message appears again - the network is unstable. The devices themselves work without any problems in their own ecosystems, but pairing is required for automation. Has anyone managed to solve such a problem?

  @WyczynowyBanan 

Witam rodaka!

Disconnect all devices from the hub and remove them from both apps. Reset KH100 hub and connect it to Kasa app only(!!!), then add TRV's and thermometers there. Check if everything works.

Then go to Tapo app settings, sync accounts with Kasa and all devices should appear here as well. It looks like there's a feature parity for TRV's while Tapo UI is much more compact and easier to use than Kasa. I did not test adding/removing devices from Tapo app, though, just synced.

In terms of network issues, ping delay is a bit high for a LAN. Please share your WiFi AP model and settings. Use static channel, 20MHz width, and only WPA2/AES (no TKIP, no WPA3). Also make a static DHCP binding for your hub's MAC address to prevent IP change. Choose address outside of dynamic range, e.g. if dynamic is .100-.254 use IP from 2-99.