@DonDiego Thank you for answering. I don't think the signal is weak, but I moved the sensors to another hub, and it seems to have solved the problem. Still it is a bit of a mystery. Why a sudden...

I have several T310 to monitor temperature and humidity. They have been working with no problem for at lest 6 months, and then suddenly 2 of them stopped delivering data at the same time, midnight....

To make my wifi cover all the area I need, i use an extender. This means some of the devices connected to the hub need to connect to the extended network, to get a reliable connection. Is it possible...