Disappearing Ship Question

[Grandpa Kim]

Slynky, I had a similar occurence in Networks I.

I lost a whole planet! The moon remained, but the planet was there one turn and gone the next. No explanation, no warning, no nothing. It never did reappear and I was left with a lonely moon properly named IX A, but no planet IX to go with it. I had owned the pair for at least 100 turns when this happened and was doing nothing out of the ordinary, just building ships and units.

I think these incidents are related but are so rare, Aaron would likely never figure it out.