Hi, yes I did re register both client app’s, didn’t make any difference, WiFi was stable, they were on the LAN, everything looked ok, thermostat device was ok, just two client devices, but an hour later they corrected themselves so everything is fine now, thank you for your help, great product, I may have an idea about heating optimisation that I implemented on an old system I made years ago, wondering if it could be incorporated somehow, will let you know