I have eleven KE100 radiator valves connected to a KH100 hub (Hardware V1, Firmware 1.5.6). Nine of them have been programmed with a schedule to turn on at 7am and turn off at 10pm every day. I can alter the times and temperature from the app and save the updated schedule.

With the two most recent TRVs I cannot set a smart schedule. When I try to save it I get a message "Network unstable. Please try again later". I am still able to adjust the temperature through the app and turn them on and off, but can't set a schedule. They are not far from the hub so distance isn't an issue. The connection from the hub is "moderate".

Any advice appreciated. Thanks!