Mine would have been recently. I was doing Patrol on Earth, also working on the 100 kills without dying. I was almost done, with maybe around 10 left. Sky goes dark, I think to myself "Great! another of my bounties can be worked on". Then the thing dropped on my head and killed me. Had to start from the beginning of that bounty. I've had many different ways though. Someone walking in front of my rocket. There was also a time where I have to get 9K EXP without dying. This was fine, but then something would end up killing me around the 8k mark. This happened a few times during the day until I finally complete it.