I've had the same problem. Game would freeze up and would not end a turn well past 15 minutes of waiting. This was for a game that was 6 years in. 5, and 10 second and 1 day intervals almost every month. 6 hours of playing but could not get past 6 years game time. Went into SM mode and game froze up when I clicked "text file" in event log. I retrieved the log, just a bunch of fighting between the starswarm and an NPR but no errors.