Thermostat / relay disconnecting

[waps69]

Hi

I have recently installed a Netatmo smart thermostat - the relay is wired to the boiler and the thermostat is wireless.

I also have 5 radiator valves.

The system remains connecting for a good period of time, but then disconnects - the phone app shows either 1, a few or all items disconnected.

The strange thing is, the time from the system disconnecting to automatically reconnecting is pretty much always exactly 40 minutes. Sometimes it may be an hour, but 9 out of 10 times it is 40 minutes.

I have disconnected all of my echo dots and Bluetooth speakers, but this has not had an effect.

Other smart home items I have that I have not tried turning off are:

Philips Hue bulbs
Sonos speakers
Eufy robovac 11c
Xbox one
PS4
Samsung smart TV
Netatmo Welcome camera

Does any one have an idea why this might be happening?

Many thanks