As suggested by Bungalo of The Canonn, I have performed a couple more experiments in an attempt to determine when a UP will light up and wail and when it will not. The data recorded can be found in the post linked in my signature.
It seems that the UP will wail when in proximity of a planet, but not a (main) star. With proximity I mean when the bottom left panel of your ship's HUD says the name of the nearby celestial body. The UP will not wail when in deep space. The significance of this is unclear.
During the last test of these experiments, I lost my UP when I disconnected while I had it out. You can see in the last video that I franctically and clumsily tried to scoop the UP when I noticed that my connection was dying. I managed to scoop the UP at the client-side in the end, but this couldn't salvage the situation. I disconnected shortly after and upon relogging, the UP was not in my cargo hold. A ticket to FD support has been sent in the hopes of getting it back.
can't see anything in any video- you haven't provided a link