Still having an issue where ships/stations in low orbit of celestial bodies with no atmospheres behave as though there is one and quickly lower the periapsis until they crash. Most recent (of several dozen) times I've experienced this was in low Minmus orbit with an Apollo-style mission. The mothership was left in a stable orbit at just about 10km, it lowered its periapsis and crashed within a fifth of a full orbit while I was piloting the lander. When I reloaded and tried to keep it stable by firing the engines intermittently (it continues to degrade while I'm piloting it), the lander quickly lowered its periapsis and crashed about a quarter of the way along it's original landing trajectory. I have experienced this issue around the mun and minmus.