XPS-3 Strangeness

[David White <whitedavidp@xxxxxxxxxxx>]

Hello. I recently purchased and installed 2 XPS-3 switches I got off
EBay. One has a WS-14A/XPSS companion switch.

Almost as soon as I installed these, I have noticed that the one with
the companion switch will sometimes turn itself off. But in the last
couple days, I have noticed that it is also sometimes turning itself ON.
The unit without the companion switch is fine.

I have a CM11A that does turn some modules on/off on timers. But the
switches in question are NOT controlled that way. Even so, the strange
events do no relate to the events that are programmed (not the same
times). I am also very sure that no one else in the area has X-10
running (I live in a pretty rural environment).

So:

(a) Do the XPS-3 units commonly have this problem?

(b) Does the presence of the companion switch make any difference?

(c) Does this seem a manufacturing defect?

(d) Could this be due to a wiring mistake on my end?

Thanks.