lethal orbit
Happened once before and I thought I'd just forgotten about changing the time, but I loaded in again today to it being a little after 0700 and knew that's not where I'd left it. Checked the Steam recording from the end of the last session and sure enough it was around 1500 when I quit to desktop.
edit: Desperate Measures quest is active currently, would have been Last Minute Efforts active when it happened yesterday.