Entry sensors going offline

Has anyone figured out why entry sensors would randomly start going offline? In my case after 2 years without a problem.

And yes I have done all of the things possible to remedy it such as replacing batteries, removing and reinstalling the sensor, moving the sensor, moving the base station, spoken endlessly with support and escalated support. Get one to stay online and a different one starts to go offline the next day. There is no rhyme or reason to distance from the base or walls between the base and sensors.

I am so sorry that I did not have a wired system put in when I built this house two years ago!