Just had a look at the waveform, and no.
The purrs themselves are consistent across all the samples I've ever looked at. That is, though the number of purrs between howls changes, the waveform is identical in every instance for the two purrs. Same for the howls. The howls are exactly the same two audio samples every time. Also, the HR 1185 B morse spells out HR 1185 B, so that is also consistent. What's not consistent is the number of purrs.
I have a theory (puts on tinfoil hat). I really think the answer is about communicating with the artifact directly. Further, I think the artifact is, as other have suggested, scared or off. I think we should spend a lot more time with the free floating ones (since their main benefit right now is that they can float indefinitely) trying to communicate. I also think we need to try different ship distances, configurations (weapons, no weapons, shields, targeted, not targeted, etc.), number of ships and just start throwing messages into the local chat to see what happens. I thought about trying to cut and paste the morse into new messages and playing it through voice comms, but I think that might be a bit too sophisticated for a game AI to understand.
Another thing just pooped into my head (yeah, pooped) and that's can we lower shields, get reaaaal close and then raise shields again so that the UA is inside our shields? It would be all nestled in and protected?