Aeotech smart switch 'can't detect device' but still working in scene

I have a light that is controlled by an aeotech smart switch. I can no longer use the UI to turn it on or off - say it can’t connect to the device. However, I have a scene in PLEG that turns it on and off with motion. Motion turns it on, but it no longer turns it off.

Any idea if this is fixable?

Well known problem of Vera.
See topics about PAN16 (in General) and Heltun thermostat (in climate)