Windows sensor

I have 4 zigbee window sensors. They worked well for at least two years. Now they are constantly offline. There was no change in distances or systems. Some presence and window sensors work without problems, others lose contact. I restart the sensor more than once and they go offline again

Have you replaced the batteries in these 2 years?

Yes, I changed it, the batteries are full

What are these sensors connected to?
Perhaps something has changed in the environment, in terms of the radio signal. Any new devices using WiFi, for example? Do you live in a building or is it a house?

Looks like a network inference issue, the hub/AP decides to use a new channel and they don’t get along well with each other.

It would be good to think about what’s changed before the issue occurred like firmware updates, new ap, or changed positions of certain devices.

thanks, I will see this