Out of the 10 or so games in the patch as IN, I have had both my retribution BS and the opposing ship fly in opposite directions of one another after prolonged contact. each case, the ships fly about 6k away from the point of contact.
I've had the same issues on my necron campaign. Escort ships fly out of the playable map space and cannot be brought back. Really a problem when fighting ram happy orks and tyranids.