Well, I have to assert my expertise in this area: I don't think that it's the poltergeist. I can tell you for certain (and I am unanimous in this!) that Yamaha has packaged some worms in their remote and Gollum, in his quest for food, activates the remote when secretly extracting his hors d'oeuvre
. And that's the truth!!!
.
However, I don't have a RX-Z1 so I don't know how the remote is activated. But, I do have a 'One For All/Kameleon' 8-Device Universal Remote and the display comes-to-life just by slightly moving it. In addition, it'll continually turn-on and off in response to the sonics from the sub. So, is it possible that you could have some low freq sound that is setting it off???
-GeorgeM