My current play-through is doing a silent CTD in the same place. I have nearly 30 hours into this PT, and am not able to advance any further. When I first ran into this a few days ago, I restarted a few times, but the CTD kept occurring at the same time\turn. The next thing I tried was going back a few turns to the next earliest auto-save. I deleted a number of surplus ships, changed a few actions, saved every turn. Within 4 or 5 turns, it was CTD at the same spot the old specific save crashed.

Map: Immense 

Diff: Incredible

Windows 10

8 Gigs Ram

R9 390 GPU.

The Altarians are the major power, and they are currently at war with one of the other powers. Of course, they have a eye-watering number of ships, and they are all on the move. The game, is consistently CTD  while processing the altarians turn, so I am pretty sure nothing I do to my empire can prevent this. I would like to be able to recover this save, and complete my PT, but there seems no crashlog we can refer too for clues, and the scant help on the matter is hardly well, helpful. Is there any way to determine the cause and work around it? 

This is not the first CTD in this PT, but I was able to carry on past all the others by simply reloading save and continuing. This is no longer the case.