"Robert Green" wrote in
:

My neighbor asked me to look at her wireless doorbell, which suddenly
stopped working properly. The buttons still work if you move them
close to the unit but they no longer work mounted on the outside of
the door frame. We've replaced the 3 "D" cells in the base unit and
the 12V cells in the two buttons but still no joy.

Any ideas?

--
Bobby G.




Any Wifi wireless ethernet around?
Or a wireless camera somewhere?
Look in those kind of culprits.
A lot of them are on the same or closeby frequency.