In my last game I noticed some Othuums I dropped died for no reason. The terrain was quite flat, and nothing was shooting at them. It happens on two occasions around 23:30. One Othuum out of four dies in my drop on the bottom expansion, and the single Othuum I dropped in the top expansion also dies.
I inspected closely to see if there was some reclaim that they landed on that killed them, but there was not. I also tried reproducing the behavior in a custom game on the same map, and another map, and was not successful in doing so.